The fake Zelenskiy account reached 20,000 followers on Telegram before it was shut down, a remedial action that experts say is all too rare. WhatsApp, a rival messaging platform, introduced some measures to counter disinformation when Covid-19 was first sweeping the world. Some privacy experts say Telegram is not secure enough Artem Kliuchnikov and his family fled Ukraine just days before the Russian invasion. Anastasia Vlasova/Getty Images
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