Despite Telegram's origins, its approach to users' security has privacy advocates worried. 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%. 'Wild West' I want a secure messaging app, should I use Telegram? Some privacy experts say Telegram is not secure enough
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