A fascinating map from French newspaper Le Monde, that shows the dominant social networks in various countries and continents.
MySpace still rules the roost, especially in the U.S.
Personally, I use LinkedIn, for business and MySpace for musical connections, mostly related to Guardian.
Truth be told, I am not a MySpace fan. I don't like the interface, and at times, I feel like I'm swimming in a giant public swimming pool that everyone is...um...er...peeing in!
It's probably my own fault as I don't turn down anyone who wants to be be my friend.
I guess I need to just go buy a wetsuit.