I used to really like facebook...5-6 years ago. Now it's for:
1. Old people
2. Nosy people
3. People who think that everyone cares about what they're doing or their kids.
I got rid of it quite awhile ago and have not missed it once. I love the facebook addict that has to tell you "Did you see this guy from our hometown died?" or "Did you see this girl is pregnant again?". WTF do I care about that? If I wanted to keep up with some old acquaintance, I'd make an effort to.
It's not always old acquaintances, though. There are plenty of people who I was very close with growing up, and it's not like we aren't still good friends, but we don't have time to be constantly in contact anymore. One of my best friends now coaches college softball in South Carolina, and I only talk to him maybe once or twice a month. But we'd both still have each other's backs in a heartbeat if needed, and we can pick up right where we left off the last time we got to hang out.
And if something happened to him, it could take some time for me to find out without something like Facebook (he went to a different high school and I'm not close with his family at all because we became friends right before we graduated and went to college; he comes down to my parents' house for a weekend whenever he's home, partly because he enjoys drinking with me and my dad, but his parents are a little more tight-laced, so I don't go up there).
When it comes to people you don't know well, sure, I don't care about who's pregnant, etc. But those types of posts are not limited to just people you don't know well.