Messages are not fully encrypted by default. That means the company could, in theory, access the content of the messages, or be forced to hand over the data at the request of a government. Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. 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. Anastasia Vlasova/Getty Images Some privacy experts say Telegram is not secure enough
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