Users blast tweets to the world at large. Facebook is a sharing tool. Users proscribe who can view their information. - http://www.marcoullier.com/blog...
"Wave feels more like Threaded Groups meets IM. Since based on the demos once you start a discussion you can only refine the discussion or forward it to others -- create new sub conversations. It has some cool/wow factor, but at the end of the day it's just another tool. FB by having distinct "entities" for friendable entities vs. fanable entities makes the service feel a little bit more disjoint. I'm a fan of "Ashton Kutcher" (not) but I might also be one of his friends, why do I need to treat the two entities as distinct. You do make a good point about having different circles of friends on different services, FB has minimal ways to manage your groups of friends. If it was more first class it would probably make things more interesting. That way you can assign a Friend Group to a 3rd party service and that's the circle of friends that would be seen/visiable/accessible on that service."
- david koblas