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Some comments are helpful in supplementing to questions/answers, but a usual reply would be a "thanks, edited that in". Instead, the OP should be able to mark that comment in a special way (say, "comment accepted" by turning the number green) to acknowledge the help without producing a noise comment.

"accept comment"

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Interesting idea (although I don't think the check mark is the right symbol here), but bad screenshot – Pëkka Sep 1 '10 at 12:53
@Pekka: I'm afraid the auto-upload makes a jpg of my png :( However, I also made mistake I fixed now... Also, you're right about the checkmark. I'll think of something else – Tobias Kienzler Sep 1 '10 at 12:57

I (sort of) like the basic idea here. Often, I've wanted to acknowledge a comment without leaving a reply - indicating to the comment author that I appreciate/found their comment useful. It certainly would cut down on a lot of comments that go like:

@user: thanks.

However, there's the obvious problem of interference with "hotness" applied to comment scores. When a score reaches a certain threshold it changes colour, ranging from cold to supernova. Also, if you change the colour range to greens for every vote on a comment for the post author it signifies importance of his vote above other all other votes which isn't always the case.

Most certainly, I wouldn't like to acknowledge all comments I vote for in this manner. I might just find a comment funny rather than particularly useful and I don't think casting my vote on that comment should change the way it looks to other users.

It's a nice-ish idea if it could be implemented in a better way without adding any bloat to the system.

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I didn't notice the already existing colouration, and your "I might just find a comment funny" point is a good point that this should be handled separately. But, as devinb states, using an "accepted comment check" also wouldn't be exactly right. Back to the drawing board... – Tobias Kienzler Sep 1 '10 at 14:16

Comments are supposed to be lightweight throwaways. They are simply added on bits of commentary.

It is meaningful to have a checkmark on the answer that only the OP gives out. The OP is saying "this is the correct answer to my question."

Is that meaningful when applied to a comment? "This comment is the most correct comment." Even "this is the best" comment isn't really meaningful because comments don't have a succinct purpose. They are used for chatter, clarification, denigration, cooperation, capitulation and sometimes gibberish. Each of those is a valid use of a comment. So what criteria are the checkmarks to be distributed based on.

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I agree with you and Pekka that the checkmark is not the correct idea. I just thought, somehow it would be nice to indicate that the comment did not just help others but also the OP in improving the answer/question. Maybe a green number instead? I didn't mean to say "best comment", only "comment that helped answer's author / OP" – Tobias Kienzler Sep 1 '10 at 13:00
@Tobias The trouble is that commenting is not directed at the OP. Answers are directed at the OP, that is the point of them. but comments can be directed any which-way. If your comment is meant to be particularly helpful, it should be an answer. – devinb Sep 1 '10 at 13:22
maybe I mixed up OP and "author of the post the is commented on" a bit, sorry for that. I meant e.g. if I post an answer, find a comment (incidentally, yours in this case) an addition my answer should have, I'd like to mark that instead of posting noise à la "thanks, that's right". The feature should of course not be abused to promote comments that were not really improving the answer's (or question's, if that is commented on) quality. – Tobias Kienzler Sep 1 '10 at 13:31
@Tobias, however a problem still exists in a few lights. A) can it be given more than once? B) Sycophantism, wouldn't it just be given out to people who write things that the OP already agrees with. This problem exists with the answer checkmark, but with the comment checkmark it would be even more prevalent, because there is no way to downvote comments, so there's no downside to leaving such a comment. – devinb Sep 1 '10 at 13:47
@Tobias, You, being open-minded, are able to have a discussion with someone who disagrees with you. Most people are not so generous. They don't like it when their ideas are questioned. – devinb Sep 1 '10 at 13:48

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