That was just recently, though. Also, there's a huge difference between writing a check and being heavily involved in philanthropy. Gates et al pursue philanthropy as they pursued their careers, but Zuck's is more of a fire and forget style of charity. I'm not blaming him for it; he's a busy guy and it'd be stupid for him to adopt the Gates model while facebook places the demands on his time that it does. Were it not for TSN, he likely would have never done either, not because he's Scrooge but because it's just not a big deal to him.

Which kind of goes back to my point. He's doing essentially the same thing as a billionaire that he was when he was running facebook from his dorm room.