Despite Telegram's origins, its approach to users' security has privacy advocates worried. "The argument from Telegram is, 'You should trust us because we tell you that we're trustworthy,'" Maréchal said. "It's really in the eye of the beholder whether that's something you want to buy into." Telegram boasts 500 million users, who share information individually and in groups in relative security. But Telegram's use as a one-way broadcast channel — which followers can join but not reply to — means content from inauthentic accounts can easily reach large, captive and eager audiences. "Your messages about the movement of the enemy through the official chatbot … bring new trophies every day," the government agency tweeted. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels.
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