This is a useful article not only because it tells you what Google knows about you (which is always interesting reading) but because it gives a hint at Google's methods and how effective they are. In my case, the methods produce spotty results, which oddly makes me happy. This is the most useful: "First, click on the link below or type it into your browser: https://www.google.com/settings/ Then click on Account history." Then scroll to the bottom to see 'Ad Settings'.
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