Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg announces Open Graph as he delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

Facebook CEO Mark Zuckerberg (Justin Sullivan/Getty Images)

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg announces Timeline as he delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg announces Timeline as he delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Comedian Andy Sandberg pretends to be Facebook CEO Mark Zuckerberg during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Comedian Andy Sandberg pretends to be Facebook CEO Mark Zuckerberg during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg (L) jokes with comedian Andy Sandberg during a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Comedian Andy Sandberg pretends to be Facebook CEO Mark Zuckerberg during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Comedian Andy Sandberg pretends to be Facebook CEO Mark Zuckerberg during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg shows off the new Timeline as he delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg shows a photo of himself as a baby as he delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg (L) jokes with comedian Andy Sandberg during a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg (L) jokes with comedian Andy Sandberg during a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)

Facebook Holds Its Fourth f8 Developer Conference

SAN FRANCISCO, CA - SEPTEMBER 22: Facebook CEO Mark Zuckerberg delivers a keynote address during 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)