Some privacy experts say Telegram is not secure enough Friday’s performance was part of a larger shift. For the week, the Dow, S&P 500 and Nasdaq fell 2%, 2.9%, and 3.5%, respectively. 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. But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. Anastasia Vlasova/Getty Images
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