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How very meta: Facebook Application Development Services, a new Facebook app launched by developer Brad O'Shea, is a kind of eLance for Facebook developers, allowing you to find a developer for your app.
These developers are in high demand right now, and sticking the app right on Facebook will no doubt lead to heavy use by the Silicon Valley set. Contacting users is still done through the usual messaging system, but this reveals the possibility that Facebook could be host to all kinds of marketplaces, taking a cut as a middleman.