Lisa, thanks for the comment and the reference to the Wikipedia article.
I like an aspect of the definition that is listed there – “a course where the participants are distributed and course materials also are dispersed across the web . . . The course is not a gathering, but rather a way of connecting distributed instructors and learners across a common topic or field of discourse.” (http://en.wikipedia.org/wiki/Mooc)
With this insight, it seems the focus is on connecting people around some topic and then leaving them there to work through it on their own (if they wish). Would you say this is the case?
Can you speak a little more about the one you are working with that has 90 participants?