Riffle seems to be a fairly straightforward socially based book discovery network. Join, link via your facebook or twitter account, type in some books that you like - the resource finds you some people to follow and shows you books that they like, based on your own interests. You can search for books as well, and Riffle gives reasonably full reviews.
It's ok, but not something that I think that I'd use myself, but you may feel differently.
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