No matter what happens, Mark Zuckerberg is still a billionaire. According to an SEC report, the Facebook co-founder sold 30 million shares yesterday, at a price of $37.58, but told investors of his plans before the stock went public. (Early Facebook investor Peter Thiel also sold roughly $633 million in stock himself.) According to our handy-dandy calculator, he cashed out $1.1 billion in the process. The stock is starting to stabilize at $31.89 — down significantly from its opening price but up from yesterday’s close. (via Hacker News)