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> The problem I found with this (and many other recommendation engines) is that I've read all of the suggestions.

Immediately had the same experience: input a Theroux, Bill Bryson and Bruce Chatwin into the engine, as I've been longing for some new travel books to read, but naturally it just gave me... five or six other books by Paul Theroux and Bill Bryson.

Definitely needs more input parameters to be useful.