Facebook is moving to position itself as the hub of all interest-based communities (Pinterest, Spotify, Foodspotting, and Goodreads, for example) with its open graph platform. The people we follow in these networks are not necessarily our friends, but people whose content interests us. At the end of the day, all of these communities are peer-to-peer. Facebook can reimagine two big peer-to-peer markets with real identity, discovery, and imitation enabled by open graph at the center.
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