Facebook shares: Mark Zuckerberg rings Nasdaq bell
18 May 2012 Last updated at 15:39 BST
Social networking site Facebook has begun trading some of its shares, priced at $38 each, on the stock exchange.
The 8-year-old internet phenomenon has been valued at around $104bn (£65bn).
In one of the largest and most high-profile share flotations of recent years, founder Mark Zuckerberg rang the bell to open the Nasdaq index remotely from his HQ in California.