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And then, on top of that, Facebook is providing a highly viral distribution engine for applications that plug into its platform. As a user, you get notified when your friends start using an application; you can then start using that same application with one click. At which point, all of your friends become aware that you have started using that application, and the cycle continues. The result is that a successful application on Facebook can grow to a million users or more within a couple of weeks of creation.
— Marc Andresson on Facebook f8