Allow new users 1 comment?
54493
Allow new users to comment for X times in a day
128269
Comments asking for upvotes/accepts
34814
Mandatory comment after downvote
124089
Commenting out a few words within a paragraph?
114749
Allow post editor to see @comments directed at him
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"?
70385
Prevent the OP commenting on their own post?
129908
Allow flagging own comments
15279
Implement a Selective Comment Ban
49430
"Add/show 1 other comment" bug strikes again
131179
How to allow new users to post without moderation in phpBB 3?
18490
Allow flagging comments on mobile site
138671
Allow users to leave an anonymous comment when voting
147193
Should the site prompt new users to include an @name in comments?
139516
User profile comments
45621
How to get initial reputation on Stack Overflow with the new-user restrictions in place?
27051
Why only one @user per comment?