I'm 29 and I looked at it the same way up until about two months ago. I've always used LinkedIn, in fact, I've had more than one job opportunity show up due to it (with respectable companies). My wife talked me into FaceBook back in November or so. Since then, I've caught up with, quite literally, dozens of people that I haven't seen in years!
MySpace, however, is for pedophiles and whores.