Thats one of the reasons I deleted mine. It's funny cause my last facebook account was my second one, I deleted my first one due to no one commenting me or anything even after I had commented them back. When I deleted it, no one texted or called me, nothing about why i deleted it.
So I made a new account months later, and still, nothing. So I was like eh forget it and deleted it, and sure enough no calls or texts as to why I deleted it.
I also could care less about the people I went to highschool, who I didn't know/talk too, and what they're doing.
I also found it to be depressing. People posting pictures of themselves going to parties, and having fun and enjoying college/life. It'd make me feel bad about myself. It's like, acording to some people, if you don't have Facebook, you don't exist. Those people forget that there's other means of communicating, whether it be my phone, text, email or AIM and they rely so heavily on Facebook, to communicate.
I'm not saying delete your facebook or anything, but maybe post on a couple of peoples walls or message them asking to hangout and if you don't get a reply at all, then maybe they're not the friends you thought they were?
Haha, wow sorry this was so long, I guess it turned into a rant, I hope it helped at least a little, lol.