Microsoft's Bing search engine is growing, but so is Google's.
The search market in 2009 saw its biggest shake-up in years with June's introduction of Bing, Microsoft's new search engine.
According to comScore's "The 2009 U.S. Digital Year in Review" report, during the course of the year Microsoft Sites grew from 8.3 percent to 10.7 percent share of all search queries with nearly all of that growth coming in the second half of 2009 subsequent to Bing's introduction.
Microsoft Sites had the largest growth in search volume at 49 percent, propelled by sizeable gains in both unique searchers (15 percent) and searches per searcher (30 percent).
However, despite Bing's initial gains Google Sites continued to hold a strong lead in the US search market with 65.7 percent of all searches in December, up 2.2 percentage points on the same month in 2008.
The US core search market grew 16 percent overall in 2009, driven by a 6 percent gain in unique searchers and a 10-percent gain in searchers per searcher.
Google Sites' search query volume grew 21 percent, driven both by gains in searches per searcher (up 10 percent) and unique searchers (9 percent).
Ask Network increased its search query volume by 12 percent, driven mainly by attracting more searchers (up 19 percent).