You can eat pizza with your milkshake. Best o' both worlds. :)
Now, what sort of milkshake are you having?
Oh.
:-S
Why not?
To put it another way: Dan's talking about creating a very robust 'enterprise level' 'server solution'. Which is nothing like what Pete's talking about, which is a decentralised, distributed (possibly p2p but that's pretty much beside the point) ad-hoc network.
Or to put it yet another way: Dan's suggesting a hardware solution to Pete's software problem.
I'll be honest and say I don't 'get' or understand it all. I'm not trying to be overly cynical, I just don't see a way it could be reliably implemented on the same scale as Facebook.
I don't see how grandpa Jones is going to get his photos to his grandkids using his swanky new iPhone.
I'm very much sticking with the Facebook analogy as it's frigging huge and surely the point of any social service is to get the masses involved.