Well, Kobo seems to be doing well with their social reading network, although I don't use it. And Amazon has their shared highlight feature, if someone turns it on, although that doesn't add to discoverability but is only if you also own the book.
Doesn't GoodReads have the ability to posts the cover and title of a book you're reading on FaceBook? (I don't use GoodReads, either)
I'm sure there's a place for a social reading network, but MR here is just about as social as I'm interested in getting.
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