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. For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. WhatsApp, a rival messaging platform, introduced some measures to counter disinformation when Covid-19 was first sweeping the world. False news often spreads via public groups, or chats, with potentially fatal effects. Anastasia Vlasova/Getty Images
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