Why You Should Care About Periscope, Twitter’s New Live-Streaming App

Live-streaming video apps are having a moment. On Thursday, Twitter unveiled Periscope, a new app that lets people live-stream from their phones to anyone who wants to watch. The app, which Twitter reportedly acquired for around $100 million earlier this year, was immediately put to use Thursday afternoon, following the collapse of a building in New York City’s East Village,

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