It has a thread, but in case anyone is subscribed to this thread, I'm checking to see how much interest there would be in a game of Mafia on the forums. It's not a RPG (though the moderator generally posts flavour text for fun) but a game about a small group of players who know their teammates and a larger group of players who don't competing about whether they can conceal or discover the identities of the smaller group while the small group secretly kills people at night and everyone votes to lynch someone at day.
http://forums.sjgames.com/showthread.php?t=132558