What that article fails to mention is he's paying billions of dollars in taxes when he sells his shares in the IPO. The big question is does the CIA pay taxes on their investment?
That's not how an IPO works -- he isn't selling ANY shares during the IPO: Facebook is. Facebook will pay the taxes on that initial IPO investment. And even if he sold his personal shares at a later date (up to him), taxes would be 15% -- we should all be so lucky
The point of the article, though, was the he never has to sell his shares. He can simply borrow money against their value, and never pay taxes.
Pretty awesome either way! You succeed, you cash in; you fail you still cash in!