Some say it's the platform for the social registry of web 2.0+. I recently registered and was able to indicate I was "at a company".  It automatically set me up with "Sun Microsystems" in my "Your Networks" section.

I forwarded this around to a group of colleagues and got an interesting response from Matt Stevens, Chief Engineer in Sun Learning Services. Matt noted, "Not looking for dates (if you will) I have not considered exploring FaceBook but I see that there are 1700 folks from Sun there.  Compelling that it was easy to be part of the SMC network - automatically really."

Last week, Facebook released a new applications platform and  invited other companies to create cool apps that can be used  inside Facebook. One app of note is the Twitter Facebook application.

David Sacks in an excellent recent article titled "The New Portals: It?s the Bread, Not the Peanut Butter" mentions:

Facebook has a new answer to the portal question. The “social graph,” or your network of relationships, will push information to you. You’ll learn from your friends. Thanks to Facebook’s new developer platform, the types of information being disseminated now include not just news, photos, events, and groups but also music, videos, books, movies, causes, political campaigns — and the list is rapidly growing into almost every conceivable category.

Somewhat coincidentally our group  is now building an internal registry  for Customer Engineers. Perhaps we should consider utilizing Facebook for our next version.