Notification for specific user's answers
23644
A "friends list" on Stack Overflow would be nice
13553
Moderators accepting answers on user's behalf after a certain time period
97524
Allow bounty owners to comment on questions they've placed a bounty on, even if they have less than 50 reputation
77934
Why there isn't a feature that lets any user on SO to request other user to answer their question?
38781
How can I get a notification when someone else's question is reopened?
86188
Get attention to a new answer to an old question
25851
New UI encourages askers to confirm or dispute duplicate votes
98110
Show if/when the answer was seen by the author of the question
76085
Notify/contact SEDE user of fix to query
119727
Notify users when they are mentioned (on meta)
39016
Inform new users if they can upvote an answer they accepted
70664
Allow me to get notifications for new Meta posts, like mods do
101825
Feature Request: "WAKE UP and accept my answer please"
34508
Notify us when the question has been edited after posting an answer
42712
Is there a shortcode for linking to a user profile in an answer?
31940
Add an alert when answering a question that has at least a close vote as duplicate
49880
Reminder of bounty expiration on someone else's question