I absolutely love Facebook's design and interface. The News Feed on your homepage is SO great. Unlike MySpace, where you have to go visit people's pages and there might or might not be something interesting, in Facebook, it comes to you.
It just occurred to me, while checking some feeds and sites, that the app I really want is something like Facebook for the whole web: that kind of integrated news, all in one place, running conversation threads.
I'm sure we'll get this soon. And, actually, it could be from Facebook.
You see, Facebook is getting a lot of (geek) press for the open API (standards) they just rolled out. They already allow me to automatically post from my weblog feed to Facebook...
I say, bring it on.