I'm glad Facebook removed the requirement that you had to be in college to join; otherwise I wouldn't be able to use it. I didn't have an account while I was in college, so I missed my chance.
It's been a nice way to catch up with friends I haven't seen in several years.
QFT ... I've done the same thing. Found many old high school friends. Saw some of them at a reunion back in 2002, while others weren't there.