Rise and fall of IS propaganda machine
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The rise and fall of Islamic State's propaganda machine

Horrific videos, slick production, social media saturation - the Islamic State group has used online propaganda like no other terrorist organisation in history.

But in September 2017, it went from a torrent to a trickle. What happened?

BBC Monitoring’s Jilla Dastmalchi looks at the rise and fall of IS’s propaganda machine.

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