Meta comments:
When you come by an old comment that reminds the user of a site policy, of an action that should have been done once the question was posted, that is no longer needed. The comment might or might not be actioned upon, but usually, even if there was no action, the comment is nothing but clutter if it's old.
Flag:
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I've edited the question for you and included markdown formatting. For more information, visit the help center.
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Please include a Minimal, Short and Verifiable example. Otherwise, this question might get closed.
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Please don't vandalize your posts.
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Welcome to Stack Overflow! Please visit the help center to learn more about the rules of this site.
Don't flag:
Don't flag meta comments if you can't be certain the OP (Original Poster) has seen them. Newer meta comments might have not been seen by the OP
Short comments under answers:
Sometimes the OP (Original Poster) aims to communicate with the answerer, and adds a comment that adds nothing to the Q/A thread. These comments are always unnecessary if they don't contain additional material that can be useful to future visitors.
Flag:
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Thanks, you saved my life!
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Oh, I'm an idiot. How could I have missed that?
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-1 bad answer
Don't flag:
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Thanks, you saved my life! This only works with the latest version though.
Edit-related comments:
When a comment is no longer valid for the latest revision of the post, or in other words, when the post is edited to address the comments. These comments should be removed because in some cases, their wording becomes especially misleading after the edit.
Flag:
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Please edit your question to include why you think this situation would occur.
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This answer doesn't work on Python 3. You should use <some function> instead for it to work. [Response: Thanks, edited the post with <some function>.]
More obvious cases:
There are also more obvious cases where everyone agrees the comments should be removed. They don't need the above formatting, so they're listed here:
- Back and forth banter, typically between two users, which has nothing to do with the contents of the post.
- Responses to deleted comments, when they make no sense on their own