11 votes
Accepted

A very active (new) user suddenly disappeared. What happened?

User accounts can be deleted for two reasons: Deletion is requested by the user while logged in Moderators delete an account because it is used to violate a site policy as a sock puppet. Examples ...
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9 votes

Dissociate an account from a question

You need to use the contact link and explicitly request dissociation. See this meta post for more information. Note also that you cannot delete questions with positively scored answers anyway.
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Only top scored, non community-wiki answers of a minimum length are eligible