Facebook Holds Its Fourth f8 Developer Conference

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Facebook CEO Mark Zuckerberg delivers a keynote during the Facebook... NyhetsfotoFinansväsen,Horisontell,Inledningsanförande,Kalifornien,Mark Zuckerberg,Offentlig talare,San Francisco - Kalifornien,Teknologi,USAPhotographer Collection: AFP 2011 AFPFacebook CEO Mark Zuckerberg delivers a keynote during the Facebook f8 Developer Conference at the San Francisco Design Center in San Francisco on September 22, 2011 in California. AFP PHOTO/Kimihiro Hoshino (Photo credit should read KIMIHIRO HOSHINO/AFP/Getty Images)