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Re:Show HN: Nod – Anonymous proximity messenger by comrh on Tuesday July 28, 2015 @02:38PM (#9963619)
I believe FireChat[1] is right up your alley. Was covered a lot during the Hong Kong protests.

1: https://en.wikipedia.org/wiki/FireChat

Re:Show HN: Nod – Anonymous proximity messenger by freewizard on Wednesday July 29, 2015 @10:42PM (#9972946)
I gave up FireChat when it has a sign up process and asks for email.