According to one tracking firm, Bing is now No.2 in the search engine climb to the top, sitting just under Google but slighty ahead of Yahoo.
Nielsen, which says its numbers represent only queries typed into a search box, Bing is currently at 13.9 per cent, just ahead of Yahoo's 13.1 per cent of the search content. Google is still the dominant market leader with roughly 65 per cent of the market.
In the past year, Yahoo has seen its share slip, while Microsoft's search engine has gained slightly, whereas Google has remained around the same percentage as the year before.
With a search deal going into effect last month, Bing is now powering Yahoo's search results in the U.S.
"Nielsen's search data only counts genuine intentional searches that people type into a search box," the company noted in a statement accompanying the August figures.
"It does not include non-intended or 'contextual' searches that are automatically generated by search engines based on a person's browsing behaviour."
Although Microsoft has over taken Yahoo by applying Nielsen's method, Yahoo still managed to gain a competitive lead in July.
According to the more widely cited Comscore numbers, a core search measure that excludes some of the slideshows and other non-explicit searches that had been giving some providers especially Yahoo a boost.
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