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I love this idea.
One area where I know this type of application would be perfect is for events when large crowds do not usually congregate. An example would be a music festival or large concerts. Most music festivals, sporting events and concerts I attend usually have a lack of adequate network coverage due to so many people being in the same area at once.
I find that most of the people at these events are trying to communicate with one another, making Tin-Can the perfect application. High Density of people, lack of working cellular coverage, quick communication within the crowd. Go for it guys!