Who's Making Money on Social Information/Media?

In an effort to learn more about who is making money and who isn't in the world of social information/media, I'm putting forth a list of the business models that I've come across. They are:

• Sell Enabling Technology (e.g. IBM Lotus, MSFT SharePoint, Yammer, PBWiki; Radian6)
  
• Provide a Transaction Platform and Take a Cut (e.g. EBay; SecondLife)
• Sell Real World Schwag (e.g. Threadless)
• Sell Digital Schwag (e.g. Facebook Gifts)
  
• End User Subscriptions (e.g. Everquest)
  
• Sell Access to User Data (e.g. Facebook; Radian6)
  
• Charge for Access to the Users (e.g. Advertising; Polls; Etc.)
  
• Sell Consulting/Learning Services (e.g. Social Media Consultants; Social Media Publishers (e.g. Forrester); Social Media Conferences)

Are these right? What other models are there? Which models are the most profitable? It seems that to some extent all of these - with the possible exception of Charging for access to users given the scale/cost base required - are viable primary business models.

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