Facebook Holds Its Fourth f8 Developer Conference

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Facebook CEO Mark Zuckerberg explains the details of Facebooks new... News PhotoCalifornia,Close-up,Explaining,Finance,Horizontal,Mark Zuckerberg,New,San Francisco - California,Technology,USAPhotographer Collection: AFP 2011 AFPFacebook CEO Mark Zuckerberg (L) explains the details of Facebooks new applications during the Facebook f8 Developer Conference at the San Francisco Design Center September 22, 2011 in San Francisco, California. AFP PHOTO/Kimihiro Hoshino (Photo credit should read KIMIHIRO HOSHINO/AFP/Getty Images)