In 2014, Pavel Durov fled the country after allies of the Kremlin took control of the social networking site most know just as VK. Russia's intelligence agency had asked Durov to turn over the data of anti-Kremlin protesters. Durov refused to do so. Some privacy experts say Telegram is not secure enough Artem Kliuchnikov and his family fled Ukraine just days before the Russian invasion. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Anastasia Vlasova/Getty Images
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