pro-Google So, let’s say you wanted to find out if there was any bias from what search engines spit out at you. For example, a recent study not done by Google, said that Bing searches would promote Microsoft-related results twice as many times that Google would promote Google.
pro-Bing Don’t get too comfortable with those facts, though. A different study, performed by a paid Microsoft consultant, showed claims that Google put itself first most of the time. Do you already know who to trust? Or are you feeling lucky? source