I already know Facebook is not exactly the place to seek meaningful connections. But I don't know about other people, I usually do not add random folks. Most of my 'friends' are old schoolmates, people I've known from one place or the other through one person or the other.
I go there to have a lil bit fun, cracking jokes, updating my status with weird stuff and what not. I'm away from lots of people i know, so it's a nice way of keeping in touch.
Also i just recently met a guy i really like off FB so, no, i'm not going to knock FB. I think it's one of those things in life that is really nothing but the value you place on it and the way you react to it. People join facebook, no one is recruited by force.