Bing «close to providing a third of all internet searches,
either directly or via such as Yahoo.» Wow - nothing here as to in just which market Bing is said to be enjoying this signal success, nor any link to a source which could substantiate the claim ! According to StatCounter (http://gs.statcounter.com/#search_engine-ww-daily-20080701-20111105), Google's share of searches worldwide seems to have remained unchanged at over 90 % these last three years, If, as seems to be the case, «Iain Thomson in San Francisco», means by «all internet searches» means only those which originate in the United States, ignoring the inconvenient fact that a majority of such searches originate outside that country, then he might be interested to learn that - again according to StatCounter (http://gs.statcounter.com/#search_engine-US-daily-2008070-20111105) - Google's market share remains just under 80 %, while Bing and Yahoo each have about 10 %. 10 % plus 10 % is not, in my opinion, anything like «close to ... a third»....
Henri