How should you deal with people who suddenly post angry comments?
138588
Dealing with what's perceived to be an offensive comment
155506
Why do we let hostile users dictate the perception of Stack Overflow?
24179
Comment posting issue
38709
How to prevent negative comments/downvoted being deleted by re-posting answers
135342
Warn new users to edit important information into the question upon their first attempt to comment on a question of theirs
148524
Why does Stack Overflow prevent new users from commenting?
30659
I am notified about old comments instead of new ones
8000
How do comments work?
7147
Allow for setting comments to "auto-expire", to become "temporary comments"
105685
Use comments to ask for clarification or add more information, then what?
44432
Allow anyone to comment but hide low-rep users' comments until reviewed
59962
Do users receive notifications for replies if the target comment is deleted?
77656
What to do with users making lots of pointless edits?
133307
What to do when a user radically changes their own question?
18805
Ripping off answers from comments
61817
Comment first, then answer, what's the etiquette?
47370
How do you choose when to show the "Please avoid extended discussions in comments" notice?