In answer to the original question. Yes I found a use for Facebook, through it I found my cousins who moved away when I was 9. Then I found my dad who I had nevermet, along with my Half Brother and Sister. Along with people I hadn't seen for years.
It can be useful.
Though right now I'm bored of it. It never works properly, Facebook Chat always freezes up and it randomly reverts back to a page I was on about an hour earlier.