Contact other users in some circumstances
128139
Notify close voters when a closed question gets edited
3666
Show OPs if someone is answering, live
158659
In Outlook, how do I give one instance of a recurring meeting to someone else?
76085
Notify/contact SEDE user of fix to query
118077
Provide indicator that another user is editing a post
23644
A "friends list" on Stack Overflow would be nice
82565
How to reopen a question by a third party
47388
How can I bump other users' unanswered questions?
5563
Asking users to accept answer when they comment that it answers their question
84734
Does there exist a user with this role?
52067
Etiquette for suggesting a user accept a different answer?
131819
"Put me in touch with whomever created it"?
17742
Encouraging users to create an account (and keep it)
84106
Can you change the related Contact of a Customer Portal User?
41917
Is there a way to communicate with a particular player or particular clan?
141840
How can I restrict program access to other users?
10812
Send authors an inbox message if their question is closed