That’s a pretty amazing difference, but supports the gist of the article, that digital transparency is hard to ascertain before companies go public. It also makes many people wonder whether the LinkedIn valuation is a sign of a new dot-com bubble.

Social Networking — Facebook and Linked-in are two of the most popular on-line social networks, but there are now millions of others catering to all ages and a myriad of interests. A look at the growing appeal of on-line social networks and their value to members in the profit and not-for-profit worlds.

The guests were: Gina Bianchini, co-founder, Ning; Andy Carvin, senior product manager, NPR Community, NPR Digital Media; Josh Bernoff, vp, principal analyst, Forrester Research; Manuel Hernandez, president,Diabetes Hand Foundation www.tudiabetes.com, and Amy Worley, Director of Digital Marketing, H&R Block, Digital Tax Solutions.

I did chuckle when Andy Carvin talked about using Twitter to announce that a guest for an NPR program had cancelled and ask for suggestions for a replacement. During CIL 2007, it was the obverse. The Tuesday morning keynote speaker couldn’t make it, so Andy filled in — and Twittered the experience. On  today’s radio show, he also talked about how NPR is using Twitter to broadcast news. Very creative, NPR!