The message was not authentic, with the real Zelenskiy soon denying the claim on his official Telegram channel, but the incident highlighted a major problem: disinformation quickly spreads unchecked on the encrypted app. Despite Telegram's origins, its approach to users' security has privacy advocates worried. The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. Anastasia Vlasova/Getty Images Some privacy experts say Telegram is not secure enough
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