The following two posts are about advertising and new business models.
"A NEW fad is sweeping across Silicon Valley, causing excitement, confusion a
I snagged this article from wharton
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.