What’s interesting about these examples is not the algorithm, some augmented form of collaborative filtering, but rather in the way that the algorithm explains itself to the user. Many years ago, with the likes of Firefly and CDNow showing off the power of recommender systems, this sort of behavior would have been considered crazy. Showing to users elements of how your algorithm works? What if they reverse engineer it and copy your methods and copy your system and steal all your users?!
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