Question answered in comments indicator
90462
Marking comment as an answer?
95252
Could new users see a notification in the space where the add comment button would be, like "you need a minimum of X reputation to comment"?
25105
Suggestion phrased as a question
62753
Comment is shifted to the right
31986
"Belongs on" comments
97892
See question when answering
102221
Color of questions with accepted answers on user profile page
130885
Information of the user in comments
70256
Notify question OP (and those who marked it a favourite) if an answer has been modified
44876
Answer appears automatically converted as a comment
82959
Can we have threaded comments?
58956
When to answer a question and when to comment on a question?
98486
Edited comment doesn't update display immediately
128221
Promoting comments to answers
144419
Is it possible to get an Edit Notification on questions or answers that I up voted?
37138
Can we make new flag responses more visible?
75546
Separate clarifying comment questions to the original post from non-clarifying comments