I just deactivated my Facebook account, and scheduled its MySpace counterpart for permanent destruction. It’s enormously liberating, and I highly recommend it.
Like a good number of others, I’ve found that Twitter does a very credible job of keeping me abreast of what my friends are doing, without the usual attendant toxic waste of time and resources. (Sparkling GIFs! “Virtual presents” that cost real money! Zombies! Fuck all of that. It turns out some things are so onerous that people will actually submit to a 140-character constraint on message size just to escape them.)