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> one big local chatbox.

If you are within the range of one user, who is having a conversation with someone in their range but not in yours, will you only see one side of their conversation?

Like Powow http://powow.info/ (also based in Netherlands)?

You say public transport, but I have my doubts it'll work particularly well on the subway.

I think that was the inspiration rather than the goal. That's how I interpreted that comment.