As terrible a thought that is too (especially given their track record on privacy), most fb users wont give it a second thought.
I have an account, mostly because of app development. I can't fathom dragging around every girlfriend, friend and acquaintance I've made with me through my entire life. There's a reason why we lose touch with most of our ex's and friends after high school, etc.
Facebook is quickly becoming the new AOL. Remember when most AOL users didn't know an Internet existed outside of AOL? Well, it seems more and more Facebook users don't realize an Internet exists outside of Facebook. AOL Keywords? Facebook (fan) pages. Etc...
I think it's a great idea and a great solution, and wonderful implementation.
But knowing Facebook, and knowing how little they care about privacy.
I think it's not something I would use, and I think people should realize how they use it.
Of course faceborg will in no way allow that information to be used by third parties either through the fb application or by any software developed for facebook. Feel free to post up more personal information in the knowledge that fb has your best interests at heart. Thank you for your time.