I read through the story to which Kerim linked, and also many of the comments. Clearly, there are a lot of unhappy people, particularly among those who pay for the service.
Good to see we are on the same page ...
Thank you for looking at this and taking the time to summarize it here. Personally, I'm pretty tolerant of these kinds of things. But then I live my life quite openly online and don't have much in the way of expectations about privacy. However, for some members of OAC these might be serious issues, and it is good to have an open discussion about them.
More troubling to me is the fact that Ning seems to be poorly managed, and there seems to be a high degree of lock-in to the system. That is, OAC could not easily migrate its data elsewhere if something happened to Ning, or there was a decision to leave Ning for other reasons (perhaps related to the issues listed above). It might be good to have a strategy in place for such an eventuality.