Facebook Holds Its Fourth f8 Developer Conference

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Daniel Ek, chief executive officer and co-founder of Spotify Ltd.,... News PhotoCalifornia,Chief Executive Officer,Computer Equipment,Facebook,Finance,Founder,Horizontal,North America,San Francisco - California,Social Networking,Talking,Technology,The Americas,The Internet,USA,Web PagePhotographer Collection: Bloomberg 2011 BloombergDaniel Ek, chief executive officer and co-founder of Spotify Ltd., speaks at Facebook's F8 developers conference in San Francisco, California, U.S., on Thursday, Sept. 22, 2011. Mark Zuckerberg, chief executive officer and founder of Facebook Inc., unveiled new features that will let users share music, movies and TV shows through the social network's website. Photographer: David Paul Morris/Bloomberg via Getty Images