What social networking sites do you use the most?

I personally use facebook a lot to talk to people I know in real life, I've tracked a lot of them down from high school and middle school. I've also got quite a few eoffefers on there.

I use last.fm to talk to people who have similar tastes as me in music.

I also sometimes use twitter, but not very frequently, since I don't really see too big of a purpose. I mostly spam facebook with my status updates. =P

I despise youtube mostly because I hate watching short videos. But it does have some informative things on there... and the music videos aren't bad. That's how I saw Interstella 5555. But I hate when people spam me with youtube links. >:C

I also use tumblr and livejournal for writing down stuff that happened and creative like things. I also like reading other people's LJs.

What about you, EoFF?