BasicallyThey're usually for clans and the like I think, it's good for 'scheduling' team games and stuff. It's pretty straight-forward as far as I can see, you join, post announcements or events to ask people along to join a game or whatever.
(
xihpete A neutrino walks straight through a bar, with v>c.,
Sat 7 Feb 2009, 17:15,
archived)