Bing is ultimately the No. two search engine in the U.S., in accordance to the newest numbers coming from comScore. Bing that launched in July 2009 with a good 8.4 %   market share, right now records  15.1 %  .
Since Yahoo slipped to 3rd, Google carried on to lead the majority of search engines in December with 65.9 pct market share.
The particular search engine rankings for Dec 2011, with respect to comScore, were actually:

  •     Google increased to 65.9 % (up from 65.4 percent in November).
  •     Bing increased to 15.1 percent (up from 15 percent in November).
  •     Yahoo decreased to 14.5 % (down from 15.1 percent).
  •     Ask stayed at 2.9 %.
  •     AOL continued to be at 1.6 %

More than 18.2 billion   searches have been carried out in December. This is actually up 2 % from November. Google lead the way because of 12 billion of the overall searches; Bing ended up with 2.7 billion, followed close by Yahoo with 2.6 billion. Ask  with 531 million queries, followed by AOL with 287 million.
In December, 68.1 % of searches carried out with Google, while Bing powered  26.5 percent of all searches.