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Telegram is a secure, encrypted chat, audio, and file sharing program for mobile phones that quickly became the preferred ISIS communications application. In September 2015, ISIS added the ability to create channels, which changed the app from simply a secret messaging app to a massive hidden forum platform ripe with content from the world’s active terrorist organizations. Multitudes of groups post in channels that are outside the scrutiny of Google and other search engines. Yet if you sign in on the phone app or via Telegram’s website today, you’ll find not only ISIS, AQ, and other terrorist channels, but a wide range of conversations. The
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Malcolm W. Nance (Hacking ISIS: How to Destroy the Cyber Jihad)