This was just my second downvote (though unintentional) but the person whose answer I downvoted came to know that I downvoted his answer. Here's the link : jQuery radio buttons not responding.
I searched so much to find out who upvoted or downvoted my questions and answers but all I found was that the votes are anonymous to all except the site admins. Then how did this person (Name: RASG) come to know that I downvoted him when This person never knows me, nor do I know him?
Votes are anonymous. However, if one is looking for someone to blame it is possible to make a guess based on existing information.
Looking at your activity list, you were active in only that one question over the last 20 hours (which was when the downvote occured). Looking at your rep graph, you had 591 rep the day before and 430 after. Taking into account other rep changes (591 - 180 + 10 + 10 = 431) one can assume you've cast a downvote which accounts for the missing -1 not listed in the rep changes.
RASG could have done such an analysis on co-answerersŧ and suspected it was you. He left an accusing comment as bait, and you bit.
What can be done?
ŧ I checked. The other answerers did not cast any downvotes during that period.
Well, in my defense - and hopefully I won't get downvotes for defending myself :) - about my answer, there is nothing to improve (for me at least, each person has their own way of coding) and the user who asked the question took it as the right one because it fixed his problem.
Now ahmedtabrez explained it was not his intention to hurt me, meaning, I believe, it wasn't personal (or because his answer, despite being right, was not chosen by Muzammil).
But think about how many people hide behind the anonymity of the downvote system and use it just to boost their own answers up?
It's frustrating to see that my efforts are not only not being rewarded, but also being penalized.
How did I know it was ahmedtabrez who downvoted?
I like to browse around the site constantly, so I'm always online.
I noticed the reputation drop at the top bar and went to question page.
Then, I just checked who was online at the time.
That's it.
Now the next question is: will people downvote this answer because they think it's not constructive or because they believe what I did is not right?
@reply in a comment unless they (a) edited the post, (b) posted the post, (c) commented on that post. So its fruitless to add the @reply.
Commented
Apr 4, 2012 at 12:05
But think about how many people hide behind the anonymity of the downvote system and use it just to boost its own answers up? Well, if an answer is good, then the downvotes of the other people won't make a difference--you'll get enough upvotes. Just take the downvotes into stride, and remember that in terms of rep, 5 downvotes=1 upvote. In terms of visibility, it can be a problem, but usually, on SO, the best answer gets voted to the top anyway. Also, this is a necessary evil of the system--not much we can do about it.
Commented
Apr 4, 2012 at 12:09
He must have guessed, only the SE developers have access to detailed voting data. Even moderators cannot see who voted on which post, though they can see some aggregate voting statistics to determine if voting fraud has happened.
There are several ways by which you can guess who downvoted with a relatively high chance. If someone commented negatively on the post, for example. Or just by observing that the reputation of another user participating in the question dropped by -1 just around the time you were downvoted.
Votes are anonymous.
I think only devs with access to the database (and too much time) can figure out the voteres.
But sometimes people leave traces:
But it still is a guess.
If you think an answer is bad, use downvote. Don't use downvotes for revenge or personal gain.
It must be a wild guess because there is no method to know who downvoted you. So he guessed because there is only one who can easily blame for it in a sherlock holmes manner.
The user can have noticed your reputation dropped by 1 or 2 points, but cannot say which answer you down-voted. Not even moderators know who down-voted what; I am not sure how a normal user would know that.
The user though the down-voter was who edited his post because the down-vote happened right right after the edit, but it could be a user down-voted the answer right after your edit, and you down-voted a completely different answer.
On Stack Exchange 2.0 sites, where the reputation on the meta site is the reputation on the main site, I could know when the reputation of a user dropped of 1 or 2 points, as the reputation shown in the meta site is synchronized with the main site, and it could happen the meta site still show the old reputation. Still, I could not know which reputation has been down-voted.
@ahmedtabrezhe used?