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I was corrected by a collegue: Khan academy is not only content, it also has a class structure with students and teachers. In that respect the functionality overlaps with Moodle, which is solely a class structure (no content).

Overall people often start with the technology and try to fill in how it could be utilized rather than having a clear idea of what one needs and then look for the tools. Dan's reply has far reaching observations of the whole business from a higher perspective.