I was wondering where Zuckerberg got $100 million in cash. Now I find out it's "$100 million" in facebook stock? Based on a valuation of... what exactly? And se

I was wondering where Zuckerberg got $100 million in cash. Now I find out it's "$100 million" in facebook stock? Based on a valuation of... what exactly? And sellable to whom? edit: I think I've answered my own question and it's based on a valuation of $23 billion. Really? Who here would be willing to buy facebook at a valuation of $23 billion? Even if you think it could be worth that much, I see a lot more scenarios where it's worth less than scenarios where it's worth more.