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This describes Yahoo's ad serving/targeting from their own Privacy Policy in 2008 (from the Internet Archive Wayback machine) at: http://web.archive.org/web/20081219224808/http://info.yahoo.com/privacy/us/yahoo/adserving/ From the Privacy Policy: " Yahoo! tries to show you ads that are relevant to you. To do this most effectively, we may use information ...


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This describes Google's "Google Display Network" from 2009, which sorts users into demographics based on their behavior, so that advertisers can show ads that are relevant to that demographic. http://adwords.blogspot.com/2010/09/new-for-google-display-network-show-ads.html From the site: "For example, if someone frequently visits sites that have a ...


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