I think this is difficult to do, given the system limitations of Ning. We tried something like this at UR and we just don't think it's sustainable. Among other hurdles, the major ones are:
1. Lack of integration with our user authentication system;
2. Lack of integration with our other sites (no API, etc)
I've written about our experience with Ning in a case study summary. The more we use Ning, the more we're finding that it probably won't be a sustainable system for us, though it might have some niche uses outside of a true campus intranet.
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