I like how quickly and easily you can move someone between Friends and Noise. As people's posting habits on here -- which are not necessarily the same as the same people's elsewhere, of course -- become clear, I find myself moving people back and forth, and I see that process continuing. I wish I could do something like it on Twitter -- potentially possible via the use of a list, BUT I believe that makes it clear to people what list they are on, and the process of moving people definitely isn't nearly so fluid. Ditto various other sites -- and G+ screws it entirely up by conflating that with privacy blocks.
Probably I won't write about process stuff here forever, but it's still new.