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. Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. Founder Pavel Durov says tech is meant to set you free In the past, it was noticed that through bulk SMSes, investors were induced to invest in or purchase the stocks of certain listed companies. Anastasia Vlasova/Getty Images
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