I can understand why he's equivocal. Facebook has pushed the social graph as far as it has by becoming the medium it manifests in - and in so doing has put itself in a culpable position. The people who use it can now blame Facebook for things that were once their own stupid fault. And through publicity and hype they have become the new privacy whipping boy. Any decision they make will be criticised. There is something to be said for artificially prolonging the debate in order to encourage a more organic consensus.