But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. After fleeing Russia, the brothers founded Telegram as a way to communicate outside the Kremlin's orbit. They now run it from Dubai, and Pavel Durov says it has more than 500 million monthly active users. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels. 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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