April 2012 US search engine rankings

US explicit core search
Google Sites led the US explicit core search market in April with 66.5% market share (up 0.1 percentage points), followed by Microsoft Sites with 15.4% (up 0.1 percentage points) and Yahoo! Sites with 13.5%. Ask Network accounted for 3% of explicit core searches, followed by AOL, Inc with 1.6%.

comScore Explicit Core Search Share Report* April 2012 vs. March 2012 Total US - Home & Work Locations (Source: comScore qSearch)
Core Search Entity	Explicit Core Search Share (%)
	Mar-12	Apr-12	Point Change
Total Explicit Core Search	100.0%	100.0%	N/A
Google Sites	66.4%	66.5%	0.1
Microsoft Sites	15.3%	15.4%	0.1
Yahoo! Sites	13.7%	13.5%	-0.2
Ask Network	3.0%	3.0%	0.0
AOL, Inc.	1.6%	1.6%	0.0

*"Explicit Core Search" excludes contextually driven searches that do not reflect specific user intent to interact with the search results.

17.1 billion explicit core searches were conducted in April, with Google Sites ranking first with 11.4 billion. Microsoft Sites ranked second with 2.6 billion searches, followed by Yahoo! Sites with 2.3 billion, Ask Network with 511 million and AOL, Inc. with 271 million.

comScore Explicit Core Search Query Report April 2012 vs. March 2012 Total US - Home & Work Locations (Source: comScore qSearch)
Core Search Entity	Explicit Core Search Queries (MM)
	Mar-12	Apr-12	Percent Change
Total Explicit Core Search	18,358	17,106	-7%
Google Sites	12,187	11,374	-7%
Microsoft Sites	2,808	2,638	-6%
Yahoo! Sites	2,523	2,311	-8%
Ask Network	555	511	-8%
AOL, Inc.	285	271	-5%

"Powered by" reporting
In April, 68.7% of searches carried organic search results from Google (up 0.1 percentage points versus March), while 25.9% of searches were powered by Bing.