The Facebook IPO

AP Photo/Nasdaq via Facebook, Zef Nikolla

Facebook co-founder and CEO Mark Zuckerberg rings the opening bell of the Nasdaq stock market on May 18, 2012, from Facebook headquarters in Menlo Park, Calif. The social media company priced its IPO at $38 per share and sold shares to the public on Friday.

Facebook CEO Mark Zuckerberg after ringing the opening bell of the Nasdaq stock market on May 18 from Facebook headquarters in Menlo Park, Calif.

The entrance of Facebook headquarters in Menlo Park, Calif. in the hours before the IPO. The eight-year-old social network company listed its initial public offering on NASDAQ Friday morning at $38 a share, giving the company a valuation of $104 billion and making its IPO one of the largest in U.S. history.

Facebook employees at Menlo Park on the Nasdaq board in Times Square seconds before founder Mark Zuckerberg rings the opening bell for the Nasdaq stock market board. The social network was set to begin trading at roughly 11:00 a.m. ET; it eventually began trading shortly after 11:30 a.m. ET due to a technical glitch.

People take pictures of Facebook founder Mark Zuckerberg on a screen in New York's Times Square moments before he rang the opening bell for the Nasdaq.

Zuckerberg on a screen in Times Square after he rang the opening bell. The stock didn't actually start trading for another two hours.

The Nasdaq board in Times Square advertises Facebook.

A television reporter inside the Nasdaq studios in front of the Facebook logo on a ticker board on May 17, 2012, in New York City. Facebook listed its IPO on Nasdaq on Friday morning with an opening price of $38 per share -- the first trades crossed the ticker at a little more than $42.

Champagne sits on a table to be passed out to executives moments before Facebook shares go public at the Nasdaq stock market on May 18, 2012, in New York.

Bystanders peering into the window of the Nasdaq stock market moments before Facebook shares went public on May 18, 2012. in New York City.

The share price of newly debuted Facebook stock is seen at the Nasdaq stock market moments after it went public.

Bystanders watch through the Nasdaq windows as Facebook shares begin trading on May 18, 2012, in New York.

A man in Times Square holds a sign in front of the Nasdaq stock exchange prior to the Facebook IPO. Facebook shares saw an opening pop fade Friday as the wildly popular social network made its long-anticipated market debut. The shares, priced at $38 in the largest-ever initial public offering for a technology company, jumped 12 percent to $42.55 in the opening Nasdaq trades before enthusiasm faded. The shares dropped back all the way to the $38 offering price before showing modest gains by the early afternoon.

An Indian girl wears Facebook T-shirt in Ahmadabad, India, on May 18, 2012.