Social media and civil unrest have long gone hand-in-hand, from coordinating revolution during the Arab Spring to repressing corruption in Turkey. Amid pro-democracy protests in Hong Kong, locals have taken to the location-based messaging app FireChat to communicate with each other. 100,000 local users signed into the off-the-grid messaging app for the first time last weekend after a student activist recommended the app for communication should authorities switch off cellular networks.

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