Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., 

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