False news often spreads via public groups, or chats, with potentially fatal effects. Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. Two days after Russia invaded Ukraine, an account on the Telegram messaging platform posing as President Volodymyr Zelenskiy urged his armed forces to surrender. Anastasia Vlasova/Getty Images 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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