CNN.Com is carrying an excellent interview/article on Gina Bianchini, CEO of Ning ... the social network platform "MedTech-IQ" is delivered to you on. She does a good job of explaining the allure & emergence of "niche" networking, as represented by our online community.
Ning has over 4.7 million unique visitors and just surpassed 1 million social networks hosted.
Read on at: http://www.cnn.com/2009/TECH/05/25/ning.social.networking.interest/?iref=t2test_techmon
See video of Gina from the "MedTech_IQ" Videolibrary describing social networking & "Viral Expansion Loops" at: http://medtechiq.ning.com/video/2140535:Video:562