> One thing that's fascinating me is how they're letting this update deploy virally, by itself.

Are you saying it's opt-in only for everyone? My friend got the new profile automatically, though I did not. I see that I can choose to get it manually, but the FAQ also says you cannot revert.

Perhaps I've misunderstood your comment. I would be really impressed if the feature had total viral deployment (i.e. opt-in only for everyone), and if it allowed you to change back to the old profile at will.