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Facebook Chairman and Chief Executive Mark Zuckerberg introduces Graph Search features during a presentation January 15, 2013 in Menlo Park. Facebook announced a search function that works within the website and allows users to search content that people have shared with you or is public. (Photo by Stephen Lam/Getty Images)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Tuesday, Jan. 15, 2013. Zuckerberg introduced ìgraph search" Tuesday, a new service that lets users search their social connections for information about their friendsí interests, and for photos and places. (AP Photo/Jeff Chiu)

Facebook Chief Executive Mark Zuckerberg introduces a new feature called "Graph Search" during a media event at the company's headquarters in Menlo Park, California January 15, 2013. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks about Facebook Graph Search at a Facebook headquarters in Menlo Park, Calif., Tuesday, Jan. 15, 2013. The new service lets users search their social connections for information about their friendsí interests, and for photos and places. (AP Photo/Jeff Chiu)

Facebook Chief Executive Mark Zuckerberg introduces a new feature called "Graph Search" during a media event at the company's headquarters in Menlo Park, California January 15, 2013. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Tuesday, Jan. 15, 2013. Zuckerberg introduced ìgraph search" Tuesday, a new service that lets users search their social connections for information about their friendsí interests, and for photos and places. (AP Photo/Jeff Chiu)

Facebook Chief Executive Mark Zuckerberg introduces a new feature called "Graph Search" during a media event at the company's headquarters in Menlo Park, California January 15, 2013. REUTERS/Robert Galbraith

Facebook Chief Executive Mark Zuckerberg introduces a new feature called "Graph Search" during a media event at the company's headquarters in Menlo Park, California January 15, 2013. REUTERS/Robert Galbraith

Facebook Chairman and Chief Executive Mark Zuckerberg introduces Graph Search features during a presentation January 15, 2013 in Menlo Park. Facebook announced a search function that works within the website and allows users to search content that people have shared with you or is public. (Photo by Stephen Lam/Getty Images)

Facebook Chairman and Chief Executive Mark Zuckerberg introduces Graph Search features during a presentation January 15, 2013 in Menlo Park. Facebook announced a search function that works within the website and allows users to search content that people have shared with you or is public. (Photo by Stephen Lam/Getty Images)