"Even though Facebook has an enormous amount of potential in many areas, millions of members still see it primarily as a social hub, and are unwilling to be pulled too far away from this purpose. "

In my opinion, this is the key element that Facebook will need to overcome. Social activity does not necessarily equate to direct business activity for Facebook. Facebook is already delivering its core product to its members - a social network. It appears that after creating a tremendously successful social structure, Facebook is now trying to re-build the foundation of the house. Not an easy thing to do.

http://scottsambucci.blogspot.com/2008/02/facebook-multiplier-economic-v...