Allow @-notification by user ID in comments
9508
How to reply to one user among two having same names?
148991
"add/show comments" should dismiss notification
18726
Receive Notifications for Comments on any Answers to Your Question
7147
Allow for setting comments to "auto-expire", to become "temporary comments"
75557
Can I get more information on an inbox notification for a comment on a deleted answer?
120030
Add button to watch questions/get notified on edits, comments, etc
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"?
16985
Comment notification shows up under responses, but not top bar inbox
44432
Allow anyone to comment but hide low-rep users' comments until reviewed
90154
Difficult to lose the "converted to a comment" status message
58991
How do I enable comments for user profiles?
74354
Indication required for up voted comment in Android app
18490
Allow flagging comments on mobile site
76085
Notify/contact SEDE user of fix to query
36066
Add the comments @ auto-complete to mobile theme
120358
Show the "add comment" link also to users who cannot add comments
87776
Allow voting on comments from Review interface