This is powerful, and I believe that the revenue stream will ultimately make up far more than one third of the firm's total sales as the article suggests. Peer

This is powerful, and I believe that the revenue stream will ultimately make up far more than one third of the firm's total sales as the article suggests. Peer to peer commerce relies heavily on social networks to guarantee quality of goods, delivery, and payment. Taking the social graph of FB and layering its own payment system would allow a big opportunity for improvement in peer to peer commerce. Imagine that you need to buy a used item, say a couch, but like many people you're concerned about buying from a random person on Craigslist. With this, you could search for a couch among your social network plus one or two degrees, and FB would take care of payment. The quality of purchase would be supported by the existing physical social network outside of FB, but mapped out inside FB. Honestly, I could see this becoming a major competitor, at least in some respects, to what eBay was supposed to do but has started to ignore (peer to peer auctions). Much more exciting to observe than them trying to monetize ad space.