Quick glance: There are rec buttons so when I add something to a shelf (for example I just added Monster International by Larry Correia and I can recommend that to someone) and there are tags/cloud type things. So, if I shelf it under "fantasy" I think that means something. I'm not sure what, but something about the visibility and when others also categorize and rate the book. I can see how others have marked the book to the right (awesome, fantasy, urban fantasy, to read, and so on).
If I figure out more, I shall report back.
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