"We are witnessing the rise of a social nervous system"

"With Twitter, I feel like I’m interacting with the world–or at least a few million folks who inhabit it. And I kind of like the bustling, fast-moving anything-can-happen feel. Facebook, by contrast, is a quieter, more mundane, more predictable place. Generally speaking, I know who I’ll run into there."

So here’s an unanswered question: Will Facebook ever open up more, in the sense of encouraging looser, more far-flung interaction between members, whether they’ve friended each other or not?