I've hung out in havens, but those are all gone now. Hung out on some MUDs and the like (MUSHes, MUCKs, MUX, etc), but haven't done any of those in the last couple of years. Did Yahoo Chat for a while before it got overrun with spambots.
I've also hung out on 3 IRC servers/networks, including Dynasty on the occasions I come chat in the pixies room. Those IRC rooms are where I'd most likely be found, when I'm chatting.