False news often spreads via public groups, or chats, with potentially fatal effects. 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. Telegram boasts 500 million users, who share information individually and in groups in relative security. But Telegram's use as a one-way broadcast channel — which followers can join but not reply to — means content from inauthentic accounts can easily reach large, captive and eager audiences. Although some channels have been removed, the curation process is considered opaque and insufficient by analysts. Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts.
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