Even if you exclusively use Google's web interface to search, the Bing toolbar gathers anonymous data about your browsing (if you've got that option enabled).

Even if you exclusively use Google's web interface to search, the Bing toolbar gathers anonymous data about your browsing (if you've got that option enabled). It's fairly clear about that when you install it. To my knowledge, all of these search engine toolbars gather statistics on a broader scale than specifically what's typed into their search fields, Google's included.