Hey, mk here. Just an average one, really. But IMHO there's no good reason why people shouldn't be able to communicate in this manner.
it just happens to be very quiet and obtuse for surveillance.
the NSA will have to install tin-can pineapples everywhere.
Well, it's their job to keep up with the state of technology, I guess.
Still, I remember the State Department talking about developing tech that was supposed to help protesters in areas that service was disrupted. Tin-Can would fit that bill.