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Google is wading into behavioral ad targeting in a big way today. It will start placing cookies on consumer’s browsers to collect information about their interests whenever they visit sites that show AdSense contextual ads. Then it will show ads targeted to those interests to the same person as he or she browses the Web on other sites that also serve AdSense ads (which is a large portion of all commercial sites).

Since Google already knows what each site or page is about, it will use this information to place each user in one of 600 subcategories of interest. If you visit tech blogs often, you are probably interested in technology. If you visit Trulia, you are probably in the market for real estate. Through AdSense, Google can now target ads not only based on the context of the page you are on, but also based on the context of the pages you have visited in the past, even if you are on a site that is completely unrelated. For instance, as a completely hypothetical example, it might show you a real estate ad targeted to the towns you were searching on Trulia when you visit a gadget blog.

Google Now Lets You Target Ads At Yourself

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