... since they compete with Google. the reason I am asking... I had a web site ranked #2 on Google and #1 on Bing & Yahoo for 130K exact searches keyword. After adding AdSence to it (which might be related or not at all) I am #4 on Yahoo and 2 on Bing. #4 on Google as well, as the main competitor ranked 3 more page of their own site that was outbidding me, but only on Google - on Yahoo other sites jumped above.