A tool to find local events in real time. This goes from the cinema programs and live concerts in the bar at the corner to spontaneous gatherings. The former exists plenty already for big cities but with every city you go to, you have to first find which one works and to which degree. The latter is probably what some would rather censor.

On the former: I like going out but somehow never find the hidden gems that friends invite me to. I want a tool that works globally where I can check for events, filtered by category. I want to see events that had a surge of interest among my follows or follows to the n-th degree.

On the latter: Security forces hate when people spontaneously gather and provoke mischief. If you reach enough people, promising 1000 bottles of free beer for the first to arrive at street address X would be enough to cause chaos.

In less cohesive societies, this could of course be used to organize revolts but even without an oppressive regime, the tool could be used to organize simple criminals to stretch the security forces thin by coordinating when to "go shopping".