Facebook IPO, Zuckberg rings Nasdaq opening bell Updated 9:41 a.m. (CBS News) Facebook co-founder and chief executive officer Mark Zuckerberg kicked off the social network's entry into the Nasdaq Stock Market this morning by ringing the opening bell at 9:15 a.m. Zuckerberg rang the open bell from Facebook's headquarters, where the company held an all-night hackathon Thursday night. True to form, the 28-year-old CEO rang the bell wearing a hoodie with a crowd of Facebook employees cheering him on. The screen outside the NASDAQ stock exchange at Times Square in New York displayed a handwritten message from Zuckerberg that read, "To a more open world and connected world." Full coverage of Facebook at Tech Talk Facebook IPO price announced, Saverin to pay taxes MoneyWatch: Facebook prices IPO at $38 per share Facebook priced its initial public offering (IPO) Thursday after markets closed. The social network is offering 421,233,615 shares of common stock at $38 per share. Facebook stock is available for trading under the ticker symbol "FB" at 11 a.m.