great picture! A great validation that the OP has a real problem... One general feedback, I think you should try hard to create the database that would fuel yo

great picture! A great validation that the OP has a real problem... One general feedback, I think you should try hard to create the database that would fuel your search. I can imagine something like a gamified data creation. Imagine a "Draw something", but instead of drawings there are books covers and titles. You give a book to two users, with this form: Describe the plot of this book(in 20 words) Describe the cover of this book (in 10 words) Describe the style of this book (in 10 words) Describe the audience of this book (in 10 words) One answer, the other try to guess. Am I gone too far? :)