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dapdPresident Obama, accompanied by LinkedIn CEO Jeff Weiner, gestures during a LinkedIn Town Hall Meeting at the Computer History Museum in Mountain View, Calif., Monday, Sept. 26, 2011, as he participates in ìPutting America Back to Work: LinkedIn Pres

REUTERSYandex founder and CEO Arkady Volozh (front, 2nd R) celebrates as Yandex is listed on the Nasdaq exchange during their IPO at the Nasdaq market site in New York May 24, 2011. The Russian Direct Investment Fund (RDIF) will be launched at the St Pete

EPAepa02143664 Tim Westergren, of the US, founder of Pandora Radio, arrives for the Time 100 gala celebrating the magazines issue on the 100 most influential people in the world at the Frederick P. Rose Hall in New York, New York, USA, on 04 May 2010. EP

dapdFILE - In this Sept. 22, 2011 file photo, employees at Groupon Inc. pose in silhouette with the company logo in the lobby of the online coupon companys Chicago offices. Groupon will report quarterly financial results after the market closes, Monday Ma

dapdThe corporate logo for Zynga is shown on an electronic billboard at the Nasdaq MarketSite, Friday, Dec. 16, 2011, in New York. Stock in the San Francisco company began trading at Nasdaq, Friday following its IPO. (Foto:Mark Lennihan/AP/dapd)

REUTERSFacebooks share prices are seen inside the NASDAQ Marketsite in New York May 18, 2012. Facebook Inc, began trading on the Nasdaq market on Friday, with its initial public offering at $38 a share, giving the worlds No. 1 online social network a $104