Class system in Online communities

Saturdays Age Insight August 4 had an interesting article on a class system developing in Internet communities. The ideas came from Danah Boyd, An American PHD student studyng online communities. She is speaking in Australia next week on what young people are doing online.
Her articles discuss the differences in class developing between Facebook and Myspace. One example she uses is the American Military ( where myspace but not Face book was recently banned) Can we draw comparisons with anything in Australia.
She says her article is purely based on observation rather than academic research. She hopes to complete academic research in the area but believes it is important to start the discussion now. It makes you wonder about the Department of Education ban on such spaces.
http://www.danah.org/papers/essays/ClassDivisions.html