That really is crazy. And Jam Koum has already cashed out at least half his stocks. Billions cashed out. The amount of money between those two guys is insane.
Similarly it's crazy to see how high up people like Moskovitz are in billionaire lists. I've gotten used to Facebook being a $400B company (now they are a $500B company), so obviously stock owners like Moskovitz will be worth tens of billions, but it's still crazy nonetheless. Just checked. He's ranked 60th richest.