Scribd has quietly become one of the world's most popular websites. The service lets you share documents, presentations, and PDFs online; its embedding feature alone has revolutionized how documents are used and shared. Still, many pieces of Scribd have been a silo; many users search for a document (often finding it via GoogleGoogle), download it, and leave. So how do you keep users engaged with your product? By launching a new wave of social features, of course.
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