Two users, one for SO, one for other sites
5404
How can I log into two different accounts on two different sites now (July 2015)?
100364
Anomalous community user activity
124417
Community User has just 1 account?
81081
Can a single user post two answers for one question?
131043
Off-site harassment by an SE user
149252
Is it possible to separate professional Stack Exchange accounts from personal ones?
31494
Website Visible only to Registered users
141623
Asking on Multiple Sites: "Soft-Migration"
30528
Requesting an active user page
20121
Can I start an application as another user without actually switching users?
20138
Allow cross-posting of questions to more than one SO site
135257
shared user accounts across workstations
125358
Content type permission to specific users
135062
United Login for Stack Exchange sites which a Person has Signed Up
125255
How to ensure that all new users have the same profile settings as the current user?
154859
Are multiple-users protected from each other differently than apps?
93242
Mixed content on many SE sites