Does Facebook count?
No, really, if you have to know, I'm really mostly not online on such services out of two
reasons, and they are both related to what I normally do when I'm on my computer.
Either I'm playing some sort of video game, in which case I find it bothersome to go
back and forth between the game and the chatting client. Or I'm writing. And when
I'm writing, I can't have any disturbances, at all.