Google plans to let users know why they see the advertisements they do in their Google searches and Gmail. Called "Why These Ads," the tool reveals that ads are personalized to the user based on a user's recent searches, geographic location, and other factors. Google will also release an Ads Preference Manager that lets users "make changes to improve the site's ad targeting or to block unwanted ads." See Google Reveals the Whys and Wherefores Behind Targeted Ads.
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