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Isn't that how a lot of internet advertising works anyway?

e.g. You're talking about medical condition X, therefore I shall try to sell you drug Y even if you don't mention Y or drugs at all in your search terms/blog post/etc. And I don't care if you even knew that drugs for X existed.

Looking at it now, it seems I described Google AdSense fairly well. Although I was thinking more along the lines of something that would insert itself into your social interactions, like Twitter sponsored tweets.

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