Despite Telegram's origins, its approach to users' security has privacy advocates worried. READ MORE "He has kind of an old-school cyber-libertarian world view where technology is there to set you free," Maréchal said. The Dow Jones Industrial Average fell 230 points, or 0.7%. Meanwhile, the S&P 500 and the Nasdaq Composite dropped 1.3% and 2.2%, respectively. All three indexes began the day with gains before selling off. Some privacy experts say Telegram is not secure enough
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