I went through college without a Facebook, but I made one shortly after graduating and I've been using it more and more (about 3 years).

I now realize that in retrospect it was a huge mistake as I missed out on a lot. I think on a certain level, if you don't have a FB, people won't make the extra effort to try and contact you. Its most important social function is turning acquaintances into friends

So just as a PSA, please please use Facebook. Even if you don't like it and you think they're a horrible company, you won't appreciate how much you're hurting yourself till it's too late