Maybe you've seen them from time to time. A group of members on a forum decide to discuss stuff among themselves and don't take it kindly when someone else decides to join the discussion. Others go to the extreme. They don't respond to threads a newbie starts unless one of their own decides to post a reply. New members who notice this [that they are being ignored] won't bother to stay around. They'll head off elsewhere to find a place where their input will be appreciated. Since such cliques are bad for any forum, how would you deal them? Or if you can prevent them from forming, how would you do it?