I limit my FB friends list to 200 people. Yes, I know I don't have 200 friends in real life, but it allows me to keep in touch with my "real" friends (mind you, I live half the world away from where I was born and raised....), and some people I consider "close acquaintances".
I don't play FB games, and I don't "LIKE" much. I use it to check out my friends' photos from their vacations, family, birthday events that I've missed, and events that I attended. If I didn't have a FaceBook account, I would have missed out on a lot of photos of friends that I rarely get to see. Yes, you could still email each other, but people post their photos on FaceBook now.
Heck, I was just looking through a friend's photos. She lives in Hong Kong. I live 12 hours away.
I don't get the hate.
Not being a part of social networking may be OK for you, but I feel that people are either closing their FB accounts because they have no time management skills or self control, or because they enjoy disliking something that's popular. If it bothers you that other people waste their own time on FB, then you're a sad individual anyway.
Rebel all you want. Delete the FaceBook account, throw away that smartphone, and perhaps delete email as well. Why not. I'm absolutely certain that most things are still do-able via more traditional methods.