I’ve noticed this, too, when I don’t erase my history–ads of sites I’ve visited suddenly pop up. Even worse, yahoo has now made it their business to track me and show me articles their software has decided I want to see. Sorry, yahoo, f_cebook, and the rest–your software cannot read my mind and cannot begin to understand what or why I might look at a site. Your software makes a lot of assumptions…most of which are wrong.