How should I handle comments?
Comments are—for the most part—intended to be ephemeral bits of information used to improve the quality of the post they're found on. If they aren't contributing to that, they generally don't belong.
If you see an ongoing discussion or argument in the comments of a post, consider stepping in and asking the parties involved to roll the fruits of the discussion into the post and take the rest of the conversation to chat. Once resolved, consider cleaning up the comment chain.
If you see personal attacks being thrown in comments, or other unacceptable behavior, delete the comments on sight and consider taking additional action, like warning the parties involved.
Can I migrate comments to chat, or another place?
Yes: from the post's 'mod' menu, select 'move comments to chat'. Bear in mind that this can only be done once - if the discussion continues in comments after you've moved it to chat, your only options are to delete the comments, edit them, or comment yourself. Also remember, users who are part of a back-and-forth chain of comments are given the option to migrate the conversation to chat themselves.
Should all comments be deleted when cleaning up a large comment chain?
While comments in general are not supposed to be permanent artifacts, consider leaving comments that link to related resources or clarify a small, tangential point in the post. On questions, also consider leaving comments prompting the asker for information that have not been addressed yet.
Can I undo a comment deletion?
Comments can now be undeleted.
...After deletion, the standard "deleted content" styles will show the just-deleted comment, along with the "undelete" link.
Also, the "X deleted comments" right side-bar quick link will now load deleted comments inline, allowing for undeletion (in certain cases)
Can I see what comments have been deleted?
To see all the deleted comments on a post, click the
mod link, then select
show deleted comments. To see them with the undelete link, click the "X deleted comments" box and the deleted comments will appear inline on the post