Barack Obama

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The chief executive officer of Twitter, Dick Costolo speaks as... News PhotoBarack Obama,Barcelona - Spain,CEO,Dick Costolo,Dmitry Medvedev,Finance,Horizontal,President of Russia,Social Networking,Spain,Talking,Technology,Twitter,US President,USAPhotographer Collection: AFP 2011 AFPThe chief executive officer of Twitter, Dick Costolo speaks as Russian President Dmitry Medvedev and US President Barack Obama are seen on a screen behind him on February 14, 2011 during the opening of the 3GSM World Congress in Barcelona. The 2011 Mobile World Congress will be held from February 15 to 17 in Barcelona. AFP PHOTO / JOSEP LAGO (Photo credit should read JOSEP LAGO/AFP/Getty Images)