But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. 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. For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. Anastasia Vlasova/Getty Images Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts.
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