Programmers.SE recently adopted the following policy on comments:

We moderators will now be actively cleaning up questions and answers that have extended discussion in comments: any additional information teased out in the comments should be re-incorporated back into the question or answer, not left as a comment. Any extended discussion should go to our awesome chat system, built from the ground up explicitly for this purpose.

If you see the original asker or answerer leave a comment instead of editing their post, you should edit it back in yourself: anyone can edit a post or suggest an edit.

Because comment deletions aren't very transparent, we will be leaving the following comment when comments are cleaned up:

Commenters: comments are meant for seeking clarification, not for extended discussion. If you have a solution, leave an answer. If your solution is already posted, please upvote it. If you'd like to discuss this question with others, please use chat. See the FAQ for more information.

and the following has been added to our FAQ:

Can I use comments to discuss the topic of a post?

Comments are useful for getting clarifications, but extended discussions detract from the question and its answers. If you'd like to discuss anything related to programming with other expert programmers, please use our chat room.

This more or less reflects the way I've been handling comments on this site, namely that any information important enough to be preserved should be in the posts, not in the comments, but I don't think we've ever really had an official policy on it - that is, comments just got deleted sometimes.

Referring to the quoted post, should we make this, or something similar, an "official" policy on this site?

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up vote 3 down vote accepted

I would expect to see a lot less of that here than on programmers, which is very discussiony.

That said, I don't mind relevant information being placed in comments, it's a form of annotation of the post. If there are 4 or 5 mildly discussiony comments, all with some nugget of information that enhances the post, even in some extremely small way, that works.

What I do mind is extended discussion in comments where there are 10-15 comments going back and forth between 2 or 3 people. We actually have a reminder now to avoid this and offer to one-click kick things to chat, like so:

True, but physicists are notorious for being stubborn. One might say we have fewer discussions but we make up for it with arguments ;-) which is why I want to have an official "excuse" to delete comment threads when they get messy. This new feature should be very useful. –  David Z Jun 22 '11 at 2:15
Neeto! That's a nice feature. Thanks. –  Willie Wong Jun 25 '11 at 12:45
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