Maybe I am a retro-grouch on this, but I for one sincerely hope nothing like this ever exists for books. Books might be the one aspect of entertainment that isn't market analyzed to death. In music, I wouldn't be surprised at all if some music execs are going to start planning on exploiting Pandora's algorithms to increase their hit count. We know that movies and TV are often altered to meet the desires of test audiences, even if, in the long run, it turns out to be the wrong decision.
With writing, you never know how you will react to a book until you pick it up. I like it that way.
--
Bill
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