With his 27 percent stake in the company, Facebook CEO Mark Zuckerberg is worth about $4 billion. (In an interview aired last night, 60 Minutes put the figure at $3 billion, but the venerable show is — how to put this delicately? — incorrect.) So what does a billion here, a billion there do for the 23-year old founder? Not much to improve his wardrobe, apparently. "You don't look like you're buying expensive clothes," interviewer Lesley Stahl tells him. Ouch. And it sounds like that paper wealth isn't doing much to improve Zuck's housing situation, either.