1. Files. A co-worker asked me to review two web sites in development and post the results for the rest of the work crew to see. I clicked both links via IM, did screen shots and posted them for the rest of the group to view. Done and done.
2. It's not about profiles, bands whoring themselves, pictures or number of friends. 'Nuff said.
3. Matt Mayers says it's better. Matt's a young techie/programmer/anime guy in our office. He doesn't cheerlead Web 2.0 stuff unless it works and is cool. And anyone knows after watching failed programming languages that it's the techs are the ones that have to embrace them. It's not the only key to success but availability of code and community developing in that code typically is your first step to success.
4. Groups. If I want to group, say, co-workers together, I can do that and share files with just co-workers, or create another group to share
5. How often do you get to deny JesusChrist as a friend but still keep him as a fan?
P.S. I have a few invites left. Email me if you'd like one - first come, first serve!