I am on facebook but rarely use it. I can't really get into that sort of networking mode. I think it's embarrassing to ask people I don't know very well to be my facebook friends. And on the other hand I have difficulties understanding why people I hardly know wants to be friends with me.
Also I see facebook as mostly schein... people are always idealising their lifes in their status messages, like "playing with my kid", "having a great evening with my friends". My own few status messages are ones that can be interpreted as either joyful or very dark and sinister at the same time, fx: "Having friends for dinner", or "Feeding the ducks with Ludvig (my son)"
I have troubles coming up with sentences that can be interpreted both ways, so if any of you know any, I'd like to hear them.