<p>The SE developers implemented and maintain it.  Note that it is the same on all SE sites, so this question presumably belongs on meta.SE, not here (it is almost certainly a duplicate, however).  The place to start is: <a href="https://meta.stackexchange.com/q/19738/187282">Who is the Community user?</a>  From there, you can read through the threads tagged with <a href="https://meta.stackexchange.com/questions/tagged/community-user">community-user</a>.</p>
