Yeah, absolutely. I think you could do a circle of trust thing with other networks so that if A trusts B and B trusts C then messages could flow from A to C and

Yeah, absolutely. I think you could do a circle of trust thing with other networks so that if A trusts B and B trusts C then messages could flow from A to C and back again. That could mitigate the pingback spam problem: not just anybody could pingback, they have to be trusted. And if your enclave gets too big then you can splinter it out and web it back together. If it's small enough it could sneak under the free limits of most PaaSes. And despite needing some kind of techy admin I think the shibboleth thing could provide a layer of cool needed to sell the thing. Not that I think this could make money. ( =