Rise of Intermediaries - Open Innovation

Henry Chesbrough discusses in his newest book, how open innovation paradigm is different from 'old' closed innovation paradigm. He illustrates following 'features' for Open Innovation:

I am curious about this "Rise of Intermediaries" area. These intermediate markets alter the incentives for innovation, and also condition the mode of entry of new technologies and new firms into an industry (Gans, Hsu & Stern, 2001). For a researcher like me the definitions and classifications of intermediate markets are somewhat blurry. In addition, I am not sure what role social media and Web 2.0 play in this development.

I have found following sub-categories within intermediate markets:
- Commercial Innovation and Intellectual Property (IP) Marketplaces (like NineSigma, http://www.ninesigma.org)
- Idea competions - loosely organised (like Open Tuesday, http://www.opentuesday.org) )
- Idea competion system providers (like Ideacrossing, http://www.ideacrossing.com)
- Crowdsourcing blogsites ( like N91, http://n91.wordontheblog.com/ )
- Outsourced innovation & design providers (like Ideo, http://www.ideo.com) 

Is this categorization realistic? Would you recommend additional categories?