Discovery is Publishers’ Problem; Readers are Doing Just Fine
Never mind the folly of dismissing Goodreads, a social network dedicated to books with 13m+ members and is steadily growing, or even Pinterest, where Random House has inexplicably attracted 1.5m followers, but the very idea that "something is really, chronically missing in online retail discovery" is arguably contradicted by Amazon's 2012 results, suggesting that "online retail discovery" isn't really a problem for readers. It's a problem for publishers.