The Google logo is seen on a podium and projected on a screen at Google headquarters in Mountain View, Calif., Monday, Dec. 10, 2007. U.S. antitrust regulators approved Google Inc.’s $3.1 billion purchase of DoubleClick Inc. Thursday, Dec. 20, 2007, removing a key obstacle to a formidable combination in the burgeoning online advertising sector. (AP Photo/Paul Sakuma)