Messages are not fully encrypted by default. That means the company could, in theory, access the content of the messages, or be forced to hand over the data at the request of a government. The picture was mixed overseas. Hong Kong’s Hang Seng Index fell 1.6%, under pressure from U.S. regulatory scrutiny on New York-listed Chinese companies. Stocks were more buoyant in Europe, where Frankfurt’s DAX surged 1.4%. The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. False news often spreads via public groups, or chats, with potentially fatal effects. Anastasia Vlasova/Getty Images
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