Facebook vs Twitter as latest refuge of the nerds

Mark Evans writes that he’s almost done with facebook. He’s not the first or the last to grumble about the blue book (see my post for example on “attention viruses”: Facebook Fatigue, it’s Spreading?.
As Mark says, is the facebook honeymoon ending? A certain schadenfreude [twopointoh-denfreude?] in me would like to claim it so (damn that [...]