Users can be blocked across all Wikia using a RegexBlock extension. This is used to prevent edits from users who impersonate others, and against page move vandals. If you have page move vandals on your wiki, please report them so a cross wiki block can be considered. Do not report simple vandals on a single wiki - they can be blocked on a per-wiki basis.
Blocked users may see the message "This username is prevented from editing due to vandalism by a user with a similar name. Please create an alternate user name or contact Wikia about the problem."