The basic "click the books you read & liked" workflow is also annoyingly flawed. There are like 20 collections that each require a page load, and some of them only contain a single book.
Having tried similar things in the past, they seemed to be much better at quickly zeroing in on what I probably had in my bookshelf. After 10 to 15 books in my library, they had about a 50% hit rate with suggestions. I. e. if someone likes Douglas Adams, chances are really high they've also read Feynman's more humorous books.
There also seems to be a problem with deduplication. One of the collections literally contains 15+ editions of "How to Win Friends..." and nothing else.
Anyway, I'm always interested on finding new books to read, so thanks.
Glad that you've been thinking on the same lines as we did.
We started with a similar concept as a facebook bot and now have made it into a web app.
Infact, I'd love it if you played around with it for sometime and make your reading lists there.