I don't use facebook.
It's an insane vanity affair for people who want to pretend thier life is interesting by broadcasting every insignificant little thing to the world.
A few of my friends who do use it say it's on the downslope anyways; becoming less active, many awful/useless features being crammed down thier throat and it's just plain getting old.
If you feel like your missing out that badly get it, if not, stay an individual whose friends actually stay friends rather then a number you pretend to measure popularity with.