Though I'm not sure Al has thought about this, it should be fairly easy to achieve the permissioning on top of it. It is just an issue of how you make the UI, so you could not only decide who get's to view what part of your profile, but also who is able to edit it. Maybe use the one we have with Wimpy Point. Talking about it, is a permissioning system, telling who get's to view what profile, part of this RFC? If not, it better should be, at least in most countries of the world.
