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Facebook Founder and CEO Mark Zuckerberg, shown in this image from Reuters video, rings the NASDAQ Stock Market Opening Bell remotely from "Facebook" headquarters in Menlo Park, California, May18, 2012. Investors are bracing for Facebook's Wall Street debut on Friday after the pioneering online social network raised about $16 billion in one of the biggest initial public offerings in U.S. history. To rapturous applause from employees, Facebook Chief Executive Mark Zuckerberg rang the bell to kick off trading on the Nasdaq market at the company's Silicon Valley headquarters at 6:30 a.m. Pacific time. REUTERS/Reuters TV