MOOC community?

Which is the “community” of a MOOC like this Rhizo14 ? Is it the union set of all people registered to any of the P2Pu forum, the Facebook, Google+, Diigo and Flickr groups and all who ever blogged or tweeted or retweeted using the hashtag or commented on any of these in any week? This would mean a large number, including rather passive participants who fired a single reaction and then left again, but it would still exclude many who may be eagerly reading, and who may be actively engaging with the discussions in their heads and may be often considering a comment just short of finishing it. More...