I deleted my Facebook account this morning. Which is to say I unsubscribed from my groups and networks, erased my friends, and deactivated the account -- you can't actually delete your account (without first creating a new account that itself can't be deleted).
I was never much into Facebook to begin with. I find social networks very interesting, all except for the socializing part. In much the same way, I'm fascinated by ham radio: all of those knobs to twist and wires to solder and antennae to twiddle. But then you have to actually talk to someone.