Despite Telegram's origins, its approach to users' security has privacy advocates worried. Telegram users are able to send files of any type up to 2GB each and access them from any device, with no limit on cloud storage, which has made downloading files more popular on the platform. Now safely in France with his spouse and three of his children, Kliuchnikov scrolls through Telegram to learn about the devastation happening in his home country. Anastasia Vlasova/Getty Images
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