Facebook IPO: as it happened

Shares in the social network end first day of trading little-changed, as investors buy and sell in record numbers leaving founder Mark Zuckerberg worth $19bn.

From Pizza dough to Facebook IPO

Facebook's Mark Zuckerberg is a familiar face at Pinocchio's Pizza in Harvard, so familiar there are now photos of him on the walls. During a recent visit, owner Adam DiCenso says, he picked up the tab and left a big tip. Though, not quite a billion dollars.

Facebook IPO: live

Facebook founder Mark Zuckerberg has rung the bell to open trading on Nasdaq as the social network floats. Follow our live coverage.