Individual messages can be fully encrypted. But the user has to turn on that function. It's not automatic, as it is on Signal and WhatsApp. False news often spreads via public groups, or chats, with potentially fatal effects. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Artem Kliuchnikov and his family fled Ukraine just days before the Russian invasion. 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.
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