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At present if you see a question that may be a duplicate and has an easy answer you can post the answers or post a link to the duplicate question. (Or the few hi-rep users can vote to close it as duplicate, think of normal users here, not the people that read Meta)

It is better for Stack Overflow if a link to the duplicate is posted as a comment, or the user votes to close the question as a duplicate. However, the user gets more rep if he/she posts the easy answer quickly.

I'm thinking of something along the lines of:

  • First person to post a comment that points to possible duplicate gets some rep if the question is closed as a duplicate and at least 2 of the other closers chose that same dupe question.

  • Whenever someone votes to close as a duplicate, a “possible duplicate” comment should be posted with a link to the other question, if there is not already a link to it in a comments. (The system now does this)


As Ether said, The removal of reputation earned from answering a question that is later closed as a duplicate would at least remove the negative incentive, but is that enough to correct this behaviour?

Is a “duplicate finder” badge part of the solution?

  • A bronze badge for being the first person to vote to close a question as a duplicate with the same “duplicate of” question chosen as most closers choose.
  • A silver badge for doing the same 25 times.

See also Dr. Strangedupe: Or, How I Learned to Stop Worrying And Love Duplication

Improve tools for closing as duplicate, would also help.

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42  
I know you were just throwing ideas out there, but I think this might work better as a badge instead of giving rep for it. –  Jon Seigel Jan 29 '10 at 18:53
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Not sure if these suggestions will work, but right now the incentives encourage rather than discourage duplicates, so I would like to see something done. –  dmckee Jan 29 '10 at 18:58
27  
One way would be to disable adding new questions. 485,397 should be enough for anyone. –  Craig Stuntz Jan 29 '10 at 19:00
8  
Gotta disagree with Craig on shutting down (or was that a joke?). We get a non-trivial number of new, objective, answerable, programming questions every single day. –  dmckee Jan 29 '10 at 19:40
67  
I've seen people (mostly, moderate rep users: 1-5k) post duplicate links as "answers". This should be discouraged IMHO. I've no practical solution at the moment though. –  LeakyCode Jan 29 '10 at 19:49
11  
Yes, @dmckee, it was a joke. –  Craig Stuntz Jan 29 '10 at 19:56
3  
@Craig: My sarcasm detector has taken a real battering of late. Must be out of calibration... –  dmckee Jan 29 '10 at 20:08
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@Jon, the advantage of giving rep is that new users see it on the page of how to get rep; I don't know if badges motive anyone. However there is no reason not to have a badge(s). –  Ian Ringrose Jan 29 '10 at 20:39
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@dmckee - The "...should be enough for anyone" (often wrongly attributed to Bill Gates as "640K should be enough for anyone.") was the hint. –  Super Long Names are Hilarious Jan 29 '10 at 20:48
12  
A hundrer upvotes and no official comment from the powers-that-be? That seems odd. –  MPelletier Nov 28 '10 at 15:26
1  
See Jeff Atwood's insightful comment on the effects of this on participation, at blog.stackoverflow.com/2011/01/…. –  Andy Thomas Jan 7 '11 at 23:29
1  
@Super y'know that Bill Gates never said that, right? –  nyuszika7h Mar 5 '11 at 8:27
11  
@Nyuszika7H: y'know that "often wrongly attributed to Bill Gates" implies just that, right? –  ЯegDwight Mar 5 '11 at 9:07
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@Reno: See here for more info on the new flagging system. –  John Mar 7 '11 at 15:36
1  
@Mehrdad: I've started a posse to clean those up. Over 600 have been removed so far. –  hammar Aug 30 '11 at 19:11

20 Answers 20

up vote 283 down vote
+700

I'd also like to see the removal of reputation earned from answering a question that is later closed as a duplicate. Currently there is little incentive to post an answer on the original question (or merely post a link to the original), rather than re-answering the question. It's tiresome seeing the same answers again and again, and seeing this behaviour awarded with reputation.

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33  
This is one of the best ideas I've heard for this problem in a long time. However, at The Great Rep Recalc (if it ever happens), I can imagine a sudden surge in Meta questions from relative newbies wondering where their hard-earned Internet dollars went. Still think this is a great idea, though. –  John Rudy Jan 29 '10 at 20:46
6  
This was wrong. See Jeff's comment below. <strike>The reputation gained for answers to closed questions does get removed eventually, when reputation is recalculated.</strike> –  Bill the Lizard Jan 29 '10 at 23:16
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@Æther: We just need to get Jeff to do global recalcs more often than once in the history of the site. :) –  Bill the Lizard Jan 29 '10 at 23:23
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@Bill: aye, or schedule targeted recalcs on users if they are affected by various things like being involved in a closed or deleted question. –  Ether Jan 29 '10 at 23:56
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@Bill: what I find interesting is that an upvote on a post that has already been closed still results in a rep gain. No wonder so many people lose tons of rep on a recalc... –  Ether Feb 1 '10 at 23:39
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@bill that is not correct -- reputation is only removed on recalc from deleted posts. We still need some duplicate questions around to cover users who have the uncanniest ability to ask the same exact question using zero words in common. –  Jeff Atwood Feb 2 '10 at 4:26
6  
@Jeff: except that's rarely the cause: it's far far more probable that they either failed to search, or the search algorithm failed them (seems like more the former than the latter, these days). –  Ether Feb 2 '10 at 4:32
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@Jeff: Thanks for the clarification. –  Bill the Lizard Feb 2 '10 at 4:48
6  
@Ether: if you think the users search first you are delusional :P If you think that they should then I probably agree but the reality is that they don't, so what they should do is irrelevant. –  Andreas Bonini Feb 7 '10 at 19:34
    
I'd agree, but with one caveat - users who delete their own duplicates first should get to keep rep (meta.stackexchange.com/questions/23802/…) –  Benjol Jun 23 '10 at 8:57
1  
Jeff is against this, so it ain't gonna happen: blog.stackoverflow.com/2011/01/… –  Andrew Grimm Jan 6 '11 at 7:05
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@Andrew: well it wouldn't be the first time that Jeff is wrong :) –  Ether Jan 7 '11 at 18:30
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I'm so tempted to flag this as 'Not an Answer' :P –  Doorknob Feb 5 '13 at 14:00
5  
This would effectively solve this problem. How many times would a user have to see the message "Reputation removed because you answered a question which turned out to be a duplicate. Click here for more details." before they started searching for duplicates BEFORE posting an answer? –  lnafziger Jul 12 '13 at 15:52
1  
I would be in favour of this, provided that there is an increase in merging of answers and that any answers merged into the original question get to keep their reputation. This means we don't penalise a really useful answer simply because an (obscure) duplicate wasn't noticed immediately. –  Duncan Apr 30 at 13:40
up vote 164 down vote
+550

I'm reviving this thread because I'm surprised there's no badge offered for this. Looking for duplicates requires more effort than other types of close vote and we're always saying that badges should be encouraging positive behaviour on the sites.

I propose the following badges:

Seeker - First question closed as a duplicate of another question you found.

Scout - 50 questions closed as a duplicate of another question you found.

Reconnoiterer - 200 questions closed as a duplicate of another question you found.

The underlying criteria would require at least 3 of the total close votes to concur with the found duplicate. Reconnoiterer could possibly be a repeatable to encourage continued behaviour. I can't see any "gaming" issues arising from this, because it requires agreement from other members of the community.

Clarification: "found" equates to finding a duplicate and casting a vote to close on that duplicate, or flagged for review with the appropriate duplicate chosen.

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1  
How would you propose tracking who found a dupe? It would be easy if you also had close vote privileges, but what if someone without close rep -- not saying "3k" because of the betas -- found one and submitted it via a mod flag, or something? –  Pops Sep 28 '10 at 14:13
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@Popular: I guess the wording could be a little better (I was trying to make it consistent with the current set of badges *wink*). This would apply only to user who cast the first close vote identifying that particular duplicate. So, to clarify, User A votes to close a question with Dupe A. User B comes along and votes with Dupe B instead, then 2 other users agree with him and 1 agrees with User A. User B's dupe has 3 votes, User A's has 2, so only User B's count towards these badges is increased. –  Andy E Sep 28 '10 at 14:26
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I like your idea, but I'm not sure I can get on board with badges only for people with close-vote rep, especially if they're doing something that anyone can do (finding dupes). Closing dupes... well, that's its own reward. –  Pops Sep 28 '10 at 14:49
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@Pop: There's a few other badges that require rep. Copy Editor and Strunk & White require editing privileges, which is only 1000 less than closing privileges. Hell, Legendary requires a minimum of 30,000 reputation ;-) –  Andy E Sep 28 '10 at 15:05
1  
@Andy, yeah... not a huge fan of Copy Editor/Strunk & White either. As a former copy editor, I think they reward a desperately needed behavior, but it does bother me that you can't even start working towards them for a while. Legendary, at least, you can start working on on day one... but it's really its own animal. –  Pops Sep 28 '10 at 15:22
14  
I fully support this, I'm constantly hunting dupes and I find very depressing to see that some users prefer answering obvious dupes to get some easy rep instead of closing, diluting existing (good) stuff. The system really needs to encourage the "right" behavior with some incentive. –  Pascal Thivent Sep 29 '10 at 5:41
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It seems to me that the easiest way to link the duplicate to the "finder" is to expand the options under "flag" to include "duplicate" with a required field for the URL of the duplicate. –  Al E. Nov 4 '10 at 0:22
1  
I like what jdv come up with with looking in comments for the first link to the duplicate if it predate the first close vote. –  Ian Ringrose Nov 23 '10 at 17:19
    
@Ian: that would allow people to start working towards this badge from 1 rep, indeed, but would require a more complicated query for the badge process. I'm no SQL expert, though, so maybe the extra overhead wouldn't be a problem. –  Andy E Nov 23 '10 at 17:26
1  
I prefer: Scout/Sharpshooter/EagleEye –  yhw42 Nov 24 '10 at 13:53
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@yhw42: the names aren't intended to be set in stone, and I expect that if these badges were implemented the team would think up their own names if they didn't like these ones. However, Sharpshooter implies a standard of accuracy rather than the ability to find things. Bloodhound might be a better alternative. –  Andy E Nov 24 '10 at 14:26
    
What these trinkets are for? –  user145842 Apr 10 '11 at 13:13
3  
"I can't see any "gaming" issues arising from this, because it requires agreement from other members of the community." I can. You could easily create a new account or even several new accounts and start posting duplicates and then with your real account you will be the first one to report them as duplicates. –  Erik B May 2 '11 at 16:22
2  
@Erik: something like that could be picked up on fairly quickly by moderators (same IP posting question as first to vote; same person first to vote on all the OP's closed questions, etc). I would say there are more complex anti-gaming mechanisms in place on SO already. –  Andy E May 3 '11 at 10:19
1  
"Reconnoiterer" => "Master Locator"? –  T.J. Crowder Apr 29 at 7:53

I'm wondering if it doesn't make sense to lower the reputation threshold to vote to close as a duplicate. Unlike other votes to close, there is already a bit of a check on this; you have to actually point out which question this is a duplicate of. That discourages (at least a little) people from doing it casually. So unlike "subjective and argumentative," where it's really a matter of opinion, and makes sense to restrict to higher reputation users, it would be good to have more participants in fighting duplicate questions.

Regarding your second point, the site already marks questions as possible duplicates after a certain number of votes. Perhaps it could do so (less intrusively, maybe) after the first vote?

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15  
or maybe a lower rep limit needed for the first person to vote to close as a duplicate, so low rep users don't just "jump on the band wagen", but can still help in the process of controling duplicates –  Ian Ringrose Apr 29 '10 at 8:50
    
I agree the rep should be lowered, but not just for the first user to vote... that seems to be just asking for the first disagreeing person to vote it down. But I'm surprised that voting as a duplicate requires such high rep - surely if I can already flag the moderator.... I can also vote for duplicate. –  Taryn East Jun 7 '11 at 17:54

Send us a package of cookies for every 100 duplicates we vote as duplicate.

No rep gaming issues, no badge gaming issues, no problem!

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37  
You're only adding to the obesity problem then. –  random Feb 2 '10 at 1:47
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@random - but... but... cookies! –  Adam Davis Feb 2 '10 at 3:15
    
@random - what obesity problem? if anything, you'd be helping to fix my constant near-malnourishment. –  quack quixote Feb 7 '10 at 19:07
    
I ordered Girl Scout cookies (A US only phenomenon I suspect) a few weeks ago and they still haven't arrived! Bonus cookies from SO would be warmly received. –  Adam Davis Feb 8 '10 at 16:12
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@Polly, your cookies were redirected to other users who have submitted more dupe reports than you have; there will be no jumping the queue –  Pops May 12 '10 at 15:07
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Don't forget that old bird that only allows 10 cookies per request –  alexanderpas Jun 19 '10 at 5:11
    
That would be quite the cometishian –  Tom Nov 24 '10 at 12:05
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@random - sheldoncomics.com/archive/101026.html –  Adam Davis Jan 5 '11 at 21:20

I am all for rewarding closevotes (not only finding duplicates). If reputation

is a rough measurement of how much the community trusts you; it is earned by convincing your peers that you know what you’re talking about.

it is illogical that only answering increases reputation but closevoting doesnt. If I supply a closevote and people follow it, I have effectively convinced them that I know what I am talking about, too - namely that a particular question should rather be closed than answered.

Moreover, even if a question is closed, it will usually have received some answers before. The reputation gained on these remains unless the question is deleted. Deletion rarely happens due to the 20k requirement. But if it remains it implies they gained trust, while those that closevoted dont gain anything at all, although they did the right thing and those that answered did the discouraged thing.

So if reputation really is a measure of community trust, closevoting should gain reputation as well. This is true for all the additional privileges gained. If we want more people to use them, we have to reward them for it. Currently, the only reason why a 3k+ user would closevote is because s/he understands the necessity of it. Unfortunately, there is even a lot of high rep users who dont see that and repwhore on whatever they can answer. Are those really the people we trust?

Regarding the problem of incorrect closing I am quite sure that this is only a minor issue. I've seen far more correctly closed questions than reopened ones. The few false positives could be further mitigated by allowing to uv/dv on the votes instead, e.g. cast a closevote and have people vote it up or down until a threshold is reached. +5 will close, -5 will fade the vote. And allow people to revoke their vote please.

Regarding rewarding and badges, I dont see why we cannot have both. Someone who continuely does her/his community duty and closevotes should be rewarded for it with a badge or two. Badges are not enough to encourage closevoting though, because once you got the badges, you dont have an incentive to closevote anymore. So we also need some reputation gain.

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7  
I think it should only be the first person to cash the "close as duplidate" vote, but the rep should only be given when the question is closed. The first person had to do the real work in finding the duplicate, the rest of the close votes take very little work. –  Ian Ringrose Nov 14 '11 at 13:03
    
Vote to delete is a 10k privilege. –  Josh Caswell Nov 14 '11 at 16:44
1  
@Josh true, but you need 20k to delete immediately. All others have to wait for two days, which makes deletion happen rarely because no one heads back to a closed question. –  Gordon Nov 14 '11 at 16:57
    
I like your reasoning about getting rid of the rep earned by people who answer questions that are later closed as dupes. But FTR I see a steady trickle of questions closed as dupes when really they're only superficially similar. –  j_random_hacker Apr 20 '13 at 17:19

Another possible solution might be to separate the problems of flagging duplicates and voting to close the duplicates. What if anyone (or almost anyone) could flag a duplicate using the functionality presently built into "close as duplicate?" Then "close as duplicate" would be enabled for higher reputation users once the first duplicate has been flagged.

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I was thinking along these lines, but with an incentive as well. However I wish to be able to see the list of possible duplicates on a question before it gets closed. –  Ian Ringrose Jan 29 '10 at 20:43

This is a terrible idea. There, let me be the first to put in a negative answer.

I have had to reopen some questions because not all SOpedians are as smart as the next bloke. They see some similar words, and think it must be a duplicate.

There also seems to be some moths that are driven to brackets around Close(n) and see their call of civic duty to blindly follow where others have gone before.

Similar to my advocating against this: Should the sportsmanship badge be awarded multiple times?, I'd like some hard numbers for % of questions actually closed as duplicates.

Let's say theoretically

0.1% closed as duplicates
0.12% failed attempts to close
0.016% reopened
no badges

I reckon you will see the close/reopen buckets both increase significantly (more towards close since it is incentive-ised) and failed attempts go through. My reasoning is simple - human nature. Just as people will cast votes for opposing answers for a week and never again for and vote solidly for another 17 days* after for (and also thereafter rarely vote again).

*If you don't believe me, just go to http://stackoverflow.com/users?tab=voters They stick out like a sore thumb with votes an exact multiple of 30.
Disclosure: I'm guilty too, but I actually continue voting as much because I do really read that many questions!

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2  
Therefore the electorate badge need to be redefined so it needs high voting over a long timer, e.g. count only 10 votes on each day. +1 for some good points –  Ian Ringrose Mar 4 '11 at 9:30
    
Thank you! Finally some sense. –  user139018 Jun 7 '11 at 19:44

The trick is to find a system that only rewards work. My proposal:

  • When (say) 5 people have identified a question x as a duplicate of question y, award rep to those 5 people and close the question.
  • Don't reveal which questions have been suggested as duplicates before a question is closed.

The 2nd point is important to avoid triggering a close-as-dupe epidemic. It means that people individually have to do the work (searching for dupes) to get the rep. You have to be fast (otherwise 5 other people will get there first), and you have to be right (pick the dupe that others picked).

Inspired by: The ESP Game from Games With A Purpose (from about 22:30 onwards, though it's all fascinating stuff!)

Thoughts? Are there ways that this system could be abused?


UPDATE 2/5/2012: Eliminating Cheating

Jeff's comment raises a valid concern that people could easily game this system by voting to close a question as a dupe and then writing a comment mentioning the other dupe; others will then vote to close as the same question. I can see this happening because there's positive feedback at work here -- both the original comment-writer and subsequent close-voters stand to make some quick rep. But I think I now have a solution to that:

To prevent people "dropping hints" about dupe-parents in comments/answers, you could simply forbid people from both identifying a question as a dupe and commenting on or answering that same question -- i.e. as soon as you do one, you can't do the other(s).

Think about it: if you see a question and immediately recognise it as a dupe of something else, there's no need to comment on/answer it. The only scenario I can think of where this might be too hard-line is when someone uses a comment to ask for clarification, and only recognises the question as a dupe after receiving that clarification, but this would be pretty rare. In the unlikely event that this turned out to be a common problem, the system could just be changed to waive the restriction for users above $SOME_THRESHOLD_REP.

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4  
I think the second point here would result in very few questions actually being closed as a dupe. A lot of genuine dupes are closed as a direct result of a link to the found duplicate being displayed in the comments. This would probably result in duplicates for niche tags almost never successfully reaching those 5 votes. –  Andy E Nov 24 '10 at 12:20
    
@Andy E's head: That is a factor, but wouldn't you agree that it would do a good job on the most common dupes? Which (by virtue of being the most common dupes) are the ones we're most interested in eliminating? Also this system offers rep as an incentive, something that's not present in the current system. –  j_random_hacker Nov 24 '10 at 12:30
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The problem is we allready have so many duplicates, that everyone could choose a different quesion as the "parent" –  Ian Ringrose Nov 24 '10 at 12:36
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@Ian Ringrose: I agree that's a problem. What if there was a standard way to choose which parent is preferable, e.g. the oldest or the one which has already had the most dupes assigned as "children"? ("Number of children" could be a per-question property -- it would definitely help "canonicalise" questions I think.) –  j_random_hacker Nov 24 '10 at 12:43
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@Ian Ringrose: Another possibility would be to reveal all suggested parents if the number of suggestions gets to a certain number without any clear winner appearing. In this case no rep would be awarded, but community-minded folks or moderators would have a useful selection of dupes to choose from and could close as dupe "traditionally". –  j_random_hacker Nov 24 '10 at 12:49
2  
Just had another idea: When X is marked as a dupe of Y, the question Y gets a +1. Rationale: (1) A question that is asked many separate times is an important question; and (2) it makes it easier for people to identify which of several roughly-equal candidates they should nominate as the dupe-parent -- just nominate the highest-scoring one. This will fold the "number of children" aspect I mentioned above into the dupe-parent-selection decision without having to separately track this quantity (which would be messy and confusing). –  j_random_hacker Jan 26 '11 at 5:46
1  
This is a great idea, except it's easy to cheat: just post a comment containing the identified dupe and 5 users can paste it in. I don't know how you could prevent that or if it is even possible to prevent. –  Jeff Atwood Mar 4 '11 at 9:58
1  
@Jeff: See what you mean. You can't prevent side-channel communication completely (e.g. if someone was determined enough, they could set up a separate site just to game it) but you can raise the "effort barrier" to the point where most people will just not bother. How about this: only award points for dupe nominations whose question digit strings (e.g. this one's is "37466") do not appear in any comment. If someone does put such a digit-string in a comment, you could pop up a warning box ("Are you sure? No points will be awarded if the question is closed as dupe!") to pre-empt rage. –  j_random_hacker Mar 5 '11 at 3:29
    
@JeffAtwood: To really prevent people "dropping hints" about dupe-parents in comments/answers, you could simply forbid people from both identifying a question as a dupe and commenting on or answering that question -- i.e. as soon as you do one, you can't do the other(s). The only scenario I can think of where this might be too hard-line is when someone uses a comment to ask for clarification, and only recognises the question as a dupe after receiving that clarification, but this would be pretty rare. (And you could even waive this restriction for users above $THRESHOLD_REP.) –  j_random_hacker May 2 '12 at 4:27
3  
Your suggestion will actually lead to less duplicates being closed. I don't automatically know a Q is a duplicate when I see it, nor do I immediately start searching to see if it is. Duplicates get closed because one person notices a dupe, links to it, and then others check to see if it actually is, and then vote to close. With your suggestion, you would need five people to independently recognize that something is a dupe. This will cause less questions to be closed as dupes. –  HodofHod May 25 '12 at 12:25
    
@HodofHod: I agree that's a factor, but I doubt it's the overriding one. One of the reasons why you don't immediately start searching to see if a question is a dupe under the current system is because there's no reward for doing so -- and what I'm proposing would change that. I think my way is also less likely to result in the "piling on" effect that we sometimes see (i.e. when the question's not really a dupe but gets closed-as-dupe anyway, because overly-officious people don't bother to read the other question carefully). –  j_random_hacker May 26 '12 at 13:54
2  
Do not forbid to comment and flag for the same question. Just do not give award points for flagging, if the user also add a public comment for this question or referring to this question. I personally prefer to add comment to link questions together even if moderators would not agree, that it is an exact duplicate. –  Michael Freidgeim Apr 19 '13 at 22:44
    
@MichaelFreidgeim: Good idea -- we want the least restrictive measures that prevent cheating. However I think it's necessary to prevent others from getting rep in this situation too, since without this it becomes tempting for others to quickly hit "Close as dupe" without thinking it through. –  j_random_hacker Apr 20 '13 at 17:02
    
Agreed. After 2 questions are linked together, reporting them as duplication should NOT be rewarded. It's too easy :). –  Michael Freidgeim Apr 20 '13 at 19:09

Not sure this is a great idea. On the surface it sounds interesting, but often times people simply skim the question and then vote to close not realizing that there are differences in the questions. It then is much harder to get the question reopened and basically an uphill battle.

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maybe if more people votes to close as duplicate, there could be a requiment for more votes to close??? –  Ian Ringrose Jan 29 '10 at 20:41
3  
The incentive will only be for the first person that finds the dupilcate, so the other 4 votes to close will be as now –  Ian Ringrose Jan 29 '10 at 20:42

You might be interested in my script Duplicate Question Suggestion Boxes which makes this more easy.

An example of its effectiveness, where otherwise the link would be hidden somewhere in the side bar:

Of course, we can't enable this for all users.

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The key to any community-based, "Duplicate Task Force" is opening and simplifying the process.

First, provide 1k+ rep users with a "flag as duplicate" option, which will allow for a single link to be provided. This makes it easy and painless to report.

Display the flag and the duplicates found to the asker (and others? Debatable.). This makes the process open, and will help the asker.

Then, facilitate moderators' (or 10k+ rep users') job by providing them with a list of duplicate-flagged questions. Allow sorting by number of duplicates found. This makes the process manageable.

Finally, provide the users who flagged the question with one duplicate or another (it's not a game to get the right one) with a small incentive. Lock down rewarding after question has been closed as duplicate. That makes finding duplicates rewarding.

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2  
this is possible now with blog.stackoverflow.com/2011/01/improved-flagging –  Jeff Atwood Jan 24 '11 at 4:38
    
@JeffAtwood: Alright! And thanks for finding this itty bitty suggestion and replying. How will the new improved-flagging help simplify warnings of duplicates? Besides there Newgrounds-style whistle level, which is pretty neat by the way. –  MPelletier Jan 24 '11 at 11:46
1  
another option possible duplicate of could've been added! –  Harish Jan 25 '11 at 12:05

I think this is a great idea. Especially the "duplicate finder" badge. It has been argued that this may require a feature to mark duplicates, but that may not be needed. Anyone who has sufficient privileges to add comments can add the link to the duplicate in a comment. If the question is closed, the Stack Overflow engine can harvest the URL, and award a badge to the user who was the first to link the question with the duplicate, albeit through a comment, or through a close vote.

Some of the other answers argue that questions are closed as duplicates, where the question is not actually a duplicate. This is true. And this may happen more often if duplicate finding is encouraged.

But this is not a problem.

If the person asking the question disagrees, she can always compose a better documented question, referring to the other questions, and point out why her question is not a duplicate. I don't expect this to happen more than a few times in every hundred duplicates, so we should not worry that this will flood the site with more duplicates.

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We should just give a badge for 'Closing as Duplicate' enough times (when it's the confirmed close reason). I do not want to disincentivize good answers even to duplicate questions. All questions deserve good answers.

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3  
And sometimes the duplicate status is not at all obvious. I've searched for and failed to find duplicates, then answered the question, only to then have somebody find a dupe using different search terms that I hadn't thought of. That doesn't reduce the value of my answer. –  Monica Cellio Jul 12 '13 at 16:07

One way to incentivize finding duplicate questions would be to make it easier to find them. A tab could be added to the review section for "Possible Duplicates".

When you type in the title for a new question, you see "Questions that may already have your answer". The functionality that creates that list could be adapted.

New questions that meet a certain threshold of commonality with existing questions could be shown along with the list of "Questions that may already have your answer" that met the threshold.

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We could implement this in much the same way as the vote to close system. A user could submit an "answer" that is somehow marking this question as a duplicate and all other users could see it, and respectively vote if it really is a duplicate. 5 votes closes the question, and maybe gives -5 rep to the asker (seems fair to me if they can't search).

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Not all duplicates are the result of failing to use teh google. –  Andrew Grimm Jan 6 '11 at 7:08

For new users, few questions are duplicate. Both new answerers and new askers get frustrated when they are trying to do the right thing, but it gets closed as a duplicate. Their initial reaction is not: "Thanks for pointing me to the right question", but: "Why are you rudely interrupting my conversation?"

The irony is that the old users enjoyed the very same thing they are denying to the new users. With the very same questions, and the very same answers: the only difference is the timestamp on the question.

Even more irony is that most high-reputation users got high reputation by answering questions instantly. The fact that they can answer instantly is a strong indicator that the question has been asked before, and is on the top of their tongue. In other words: most high reputation users are very good at answering duplicates.

At the end of the day, the fact that only a small number of duplicates gets closed means its not a big problem. But until duplicates are closed in a socially acceptable way, I think it would be a very bad idea to reward or even encourage more duplicate closes.

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I know its tiresome to see duplicate questions but I am guilty of this as it is sometimes hard to find the duplicate in the sea of questions. I wanted to ask a question about deleting my own posted question, I did a search for this and came up with 50 pages of questions with the same search parameters. I looked at the first few pages...but this got me thinking that sometimes users post duplicates because they need the answer but don't want to search through the sea of questions as this would take more time than posting a question. I like the idea of rewarding the finding of a duplicate to the first person who finds it then it gets put up to vote and if enough votes agree then it gets merged into the old question answer.

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I think that a combined approach would be the best solution.

Andy E's badge suggestion looks promising, but I think it would be much more effective when combined with removing rep earned by answering dups as Ester suggested and possibly even awarding some small amount of rep for successfully closed dups like Gordon suggested.

Above and beyond these measures I suggest:

  • Making the Related Posts column visible in the First Posts Review queue, so that obvious duplicates stand out and can hopefully be caught as a part of the review process.

  • Adding "asking too many duplicate questions" to the list of reasons that one could be question banned, even if those duplicates have not been deleted.

Note:
Apparently there's no way to find out whether asking an excessive amount of duplicate questions is currently taken into account in the auto-ban equation. If they are please disregard.

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I'm pretty sure it is already taken into account, but there's no way to confirm. –  Emrakul Jul 10 '13 at 17:56
    
@EmrakultheAeonsTorn I know deleted questions are, but I couldn't find any indication that duplicates were. –  apaul34208 Jul 10 '13 at 17:58
    
There won't be; the algorithm is a closely guarded secret. –  Emrakul Jul 10 '13 at 17:58
    
I know, but when looking at meta.stackexchange.com/questions/86997/… duplication doesn't seem to be mentioned as a possible reason for a ban –  apaul34208 Jul 10 '13 at 18:00
    
I would be surprised if it were ignored, since it detracts from the site, but I'm not going to preclude the option that it isn't. –  Emrakul Jul 10 '13 at 18:01

This answer is more for consideration purposes if/when implementing this feature-request:

  1. The binding vote-to-close (and re-open) for gold tag-badge holders should be considered here. For now questions closed as a duplicate (or re-opened after being closed) may be excluded from any consideration for badge-worthiness.

    There is distinct difference between how Stack Overflow is hammered with close votes in comparison to other network sites. So this may be a non-issue to start with. After all, tag gold badge users are considered trusted in that "field".

  2. Another thing to consider is how mods are affected by finding (obvious) duplicates. As they possess the ultimate dupe-hammer, they may never be able to attain these badges.

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why should such questions be excluded? If I go and dupehammer enough questions to get this badge or rep or whatever the prize is, but they should never have been closed, flag me. I think people with gold tag badges have proven themselves pretty trustworthy, and MOAR CLOSING AS DUPE is exactly what we want from them. –  Kate Gregory May 17 at 15:40
    
@KateGregory: I do mention "for now"... I know that Stack Overflow is a different beast compared to the other networks. There closures are a problem since people just seem to pile any old question on the community. –  Werner May 17 at 16:28
    
Yes, you mention "for now" but you don't mention why. You seem to think it's obvious since you say "without a doubt" - but I don't know why you think they should be excluded, and I am asking you to explain it. –  Kate Gregory May 17 at 16:38
    
@KateGregory: I've lightened my opinion with a mild caveat. –  Werner May 17 at 16:43
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I am sorry that there are people in the world who say "why do you want X?" when they mean "I don't think you should want X." If I was one of those people, then "for now" and "maybe" would mollify me. I am not. You are free to want and support whatever you want. Perhaps I will join you in wanting that if I have any idea why it is good. I am asking for your reasons because I can't think of any and if some exist, I want to learn them. I am not asking you to back away from your opinion, but to share more of it with me for my enlightenment. –  Kate Gregory May 17 at 16:45
    
@KateGregory: No worries. I know there are robo-reviewers out there. And I was concerned about that. Non-Stack Overflow networks don't get review audits (or at least I've never seen one on TeX - LaTeX where I'm active). I was just concerned that someone with a dupe-hammer that doesn't have the sense to properly review get to just run wild... Of course, this may be a very cynical view on things, since the community will step in to correct this behaviour. I was erring on the side of caution. –  Werner May 17 at 16:49

Maybe you could add "flag as possible duplicate" as a top-level option in the flag-moderator box? (with a requirement for a link).

That makes it more obvious promoting it happening more, and opens it up to lower-rep people to flag as possible duplicate, without directly voting for duplicate.

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That's a good idea that already exists! "Flag" -> "Doesn't belong here" -> "Exact Duplicate". –  yhw42 Jun 7 '11 at 18:16
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Thanks for letting me know. That is extremely non-obvious to me. "doesn't belong here" smells to me of offensive language or spam... I would not click on it unless I found a particularly noisome question. Especially given that this thread is about promoting duplicate-post flagging, I'd consider adding "duplicate" as a top-level flag option to make it more obvious. –  Taryn East Jun 7 '11 at 19:17

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