Facebook Holds Its Fourth f8 Developer Conference

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Spotify CEO Daniel Ek makes an appearance during a keynote address by... News PhotoAppearance,Business,California,Conference - Event,Corporate Business,Facebook,Facebook f8,Finance,Keynote Speech,Mark Zuckerberg,Public Speaker,San Francisco - California,Social Networking,Speech,Technology,USA,VerticalPhotographer Collection: Getty Images News 2011 Getty ImagesSAN FRANCISCO, CA - SEPTEMBER 22: Spotify CEO Daniel Ek makes an appearance during a keynote address by Facebook CEO Mark Zuckerberg at the Facebook f8 conference on September 22, 2011 in San Francisco, California. Facebook CEO Mark Zuckerberg kicked off the conference introducing a Timeline feature to the popular social network. (Photo by Justin Sullivan/Getty Images)