I tend to use Facebook like JC, background for ‘water cooler’ conversations and to avoid work.
Practically it’s been pretty good for promoting certain activities and for communicating quickly within a group of people, but then that falls down because of the 2-3 who won’t/can’t use it or won’t/can’t check it. So messages end up being triplicated by FB, phone and email as the same applies to each form. Fortunately I can usually cut and paste the same message and send it from my laptop, if the phone is hooked up to it.
Can’t be bothered with any of the games except Lexulous. Tried bejewelled and got bored. I don’t think I’m much of a joiner . . . .