Mark Zuckerberg started today a rich man. Then he rang the Nasdaq opening bell from Facebook's Menlo Park, Calif., headquarters and two hours later his company made its stock market debut at $38, immediately surging to $42.05 per share before dipping to $41.31 an hour later. By the market's close, Facebook shares cost $38.23.

Before the market even opened on Friday Facebook had already nabbed $16 billion, having sold 421.2 million shares for $38 a pop in initial trading after the markets closed yesterday, according to Bloomberg.