For years, Googles natural enemies seemed to be Microsoft and Yahoo. but as the search giant trounced those giants in the search space battle, its been slowly losing momentum in what may turn out to be the real war -- for the ad revenues that come from display and for being the king of the Web -- to an unlikely foe: the dorm-room-born Facebook.
Source:
http://www.wired.com/epicenter/2010/11/google-fears-facebook/
