Does any one use IRC ?
Its more or less the universal chat protocol used by billons of people, probably invented the concept of 'chat rooms'. I'm only two months older then when a very early IRC became available.
I'm normally on irc.freenode.net hanging around the #pcbsd, #vim, and #kde channels so I use it often. My favorite clients being Konversation, X-Chat, and ChatZilla.