comScore releases December 2013 U.S. search engine rankings
Google (GOOG) Sites led the U.S. explicit core search market in December with 67.3 percent market share (up 0.6 percentage points), followed by Microsoft (MSFT) Sites with 18.2 percent (up 0.1 percentage points) and Yahoo (YHOO) Sites with 10.8 percent. Ask Network accounted for 2.5 percent of explicit core searches, followed by AOL, Inc. (AOL) with 1.3 percent.