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. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp. He adds: "Telegram has become my primary news source." Anastasia Vlasova/Getty Images
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