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. But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. Anastasia Vlasova/Getty Images Again, in contrast to Facebook, Google and Twitter, Telegram's founder Pavel Durov runs his company in relative secrecy from Dubai. Some privacy experts say Telegram is not secure enough
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