Facebook Holds Its Fourth f8 Developer Conference

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Facebook CEO Mark Zuckerberg delivers a keynote during the Facebook... News PhotoCalifornia,Chief Executive Officer,Finance,Full Length,Horizontal,Keynote Speech,Mark Zuckerberg,Press Conference,Public Speaker,San Francisco - California,Speech,Technology,The Internet,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)