The Web Mini Feed?
I've always felt that much of what Facebook offered it's user base could be recreated by mashing up a bunch of web services like Flickr, YouTube, Delcious, Digg, Blogs, Twitter, etc. And if you are already using all of those services, then that mashup is potentially a lot more useful than Facebook.
The one thing that has been missing is the mini feed itself. Some of that is happening at Tumblr where people can import all of their activities into a personal mini-feed. But today's announcement of FriendFeed is pretty interesting to me. I'd like to follow the top 500 people in my Xobni network's activities and probably a bunch more.
But I won't know for sure how interesting FriendFeed is until I can try it. Invite anyone?