I agree. Not only can Google+ not get away with what FB can given their respective market positions, they could use it as a differentiating feature. And not on

I agree. Not only can Google+ not get away with what FB can given their respective market positions, they could use it as a differentiating feature. And not only that, but it seems like an obvious complement to the Circles feature, so you can present yourself differently to different Circles, even to the same person depending on which Circle you share to. And it could be a progressive enhancement, too, in that it could be completely invisible to people who aren't looking for the feature. So many reasons to allow them, and so few good reasons not to.