Do you remember what Zuckerberg said with this announcement? The 'pristine' social graph?

That's the whole point. He's trying to restore the meaningfulness of saying someone's a friend. Friends don't enroll friends in NAMBLA. I have to say, for the second day in a row I kind of agree with Zuckerberg. This isn't going to be popular, but it could actually lead to Facebook being less of a distraction and more of a genuine form of communication.