Social networks, what do you use?

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You all know that today world and especially internet is basically ran by social networks. We see facebook everyday in newspapers, on every internet page facebook is mentioned, even in the news and on television it's constantly mentioned. Twitter is also here and there, a little bit of everywhere. Before these two MySpace was also a must have to be accepted thing, and a lot of others, like high5 or I don't how many of those exist. We all use some of those, at least most of us. So, which one do you use and prefer? Which one has the best characteristics for you and suits you best? Which one do your friends use? I use just facebook (and MyLot if we count it as a sort of social network :D ), and I'm there but I rarely use it, mostly just to chat with friends that live far away who I can't see that often or to arrange some meetings with my close friends. What do you mostly do on your social network sites? Have a nice day! menzis00