In regards to your second point, I think part of that has to do with the services available. I think we will see more innovative applications and opportunities born out of the way consumers are accessing and using the data.  

Thanks for these very interesting data. We did look at the health care tribes/communities and what we found interesting is that beside doctors and nurses communities, there are many “tribes” around specific diseases like chronicle ones: http://blog.ecairn.com/2011/01/11/analysis-of-4-networks-of-communities-of-influencers/

Also, while the impact of social media and internet in general is huge. It seems difficult for companies to build successful services as we see with Google health being discontinued
http://www.google.com/intl/en-US/health/about/

Best