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Facebook is in many ways an anti-model for libraries, but from this one action libraries can learn much. On May 24, 2007, Facebook became a platform: a set of resources — services, data, tools — that enable independent developers to create applications. Interesting possibilities open up if we think of libraries as platforms...open platforms. A library platform would be about developing knowledge and community, not primarily for developing software. Still, like an open software platform, it would: