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Re:Facebook's 3rd Biggest Advertiser is a Bing Affiliate Scam by ohashi on Tuesday January 18, 2011 @10:47AM (#2116133)
That's just retargetting, quite common.
Re:Facebook's 3rd Biggest Advertiser is a Bing Affiliate Scam by Matt_Cutts on Tuesday January 18, 2011 @11:05AM (#2116212)
ohashi beat me to it. That's almost certainly a website that you've visited using retargetting. More info: http://www.bizreport.com/2010/03/google_adwords_finally_gets... . Article starts out "While Yahoo, ValueClick and other ad networks have offered ad retargeting for some time, Google has only just released it to their AdWords customers after twelve months in beta."