Facebook CEO Mark Zuckerberg smiles after speaking at Facebook headquarters in Menlo Park, Calif., Tuesday, Jan. 15, 2013. Zuckerberg introduced “graph search" Tuesday, a new service th

 

              Facebook CEO Mark Zuckerberg smiles after speaking at Facebook headquarters in Menlo Park, Calif., Tuesday, Jan. 15, 2013. Zuckerberg introduced “graph search" Tuesday, a new service th
Facebook CEO Mark Zuckerberg smiles after speaking 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)