The following two posts are about advertising and new business models.
"A NEW fad is sweeping across Silicon Valley, causing excitement, confusion a
From the NY Times, "The Gated Social Network. I don't want to belong to any club that will accept me as a member, Groucho Marx famously said. He would have loved the Web's newest social networks."
Business development idea - the growing market for business social networking
This is the what and how of social information management
I came across an article about teams "working together when apart" that offers ideas for business social networking software. Especially the part about developing personal profiles where team members can quickly learn about each other - expertise locator, and work together. Check out the demo.