An online networking website where people with no lives meet up and pretend that they do have lives. A stalkers dream come true.
Can also be used to pick fights, annoy random people and impersonate naive unsuspecting souls.
Alternatively, it can also be used as an extremely lame conversation starter.
Bimbo #1 - Heyyyyyyyy!!! are you there on facebook ?
Guy - No. I have a life.
Pervert - Hey kid add me to facebook =) i want to be your friend