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. READ MORE Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat.
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