I hate parts of it, specifically the people who use it. It's like every time someone logs on their IQ drops 30 points. Evry wrd iz spelt liek dis n it drivez me Nsane! LOLOLOLOLOL!!!!1111oneone!!11 I especially hate all those dumb groups people make on it. "Join this group if you like Ice Cream Sandwiches!" "Join my group if you hate cats!". There are so many pointless groups and quizzes people make just so they can think that other people think they are quirky and funny. Which Twighlight character are you? What type of fucking TREE are you? Which candy are you like? Every so often I will convince myself to give Facebook another shot, and about three minutes after I log in every time, it drives me insane. People adding me as 'Friends' just because we went to the same highschool? There were 2400 other people there and I never even met you! Friend doesn't mean someone you once made eye contact with.
Also, now that Facebook is so popular it's hard to keep your own privacy. If you go to a small party and make an ass of yourself in front of a dozen or so people, you're bound to end up on at least one of their Facebook pages for all of their 500 friends to see. I'm sure there are plenty of pictures of me online that I don't even know about.