>I believe his net worth is somewhere near $800 million.
With 7% of facebook, his net worth is quite a bit higher. Given a facebook valuation creeping up on $100B, his net worth is probably in the $4-7B range.
I'm sure it's been diluted, but he would have also had options. That's why I gave such a broad guesstimate. i also recall reading an interview with him a while back where they asked, "now that you're a billionaire, is a billion dollars cool?" or some such.
I'd be very surprised if he wasn't worth at least a couple billion.