Ning reached 500,000 social networks, a fascinating milestone. Classroom 2.0 passed 12,000 members this weekend, and the Ning in Education network hit 2600 members a few hours ago. I think we're learning a lot about using the community and creativity aspects of social networking in highly educational settings, and (maybe) getting a little past our pre-conceived notions of social networking that came from early experiences with MySpace and Facebook.
Of course, even though I do consulting work for Ning and consider myself their "education evangelist," I want to say "Good on ya, Ning!" I do believe that they've played a great role in helping to redefine our perceptions in this area.