Telegram CEO, Pavel Durov, is under investigation over criminal activity on the messaging app. He spent four days in detention after being arrested when arriving in France and is now barred from leaving the country.

Sumi Somaskanda speaks to the BBC's Cyber Correspondent, Joe Tidy about what Durov's arrest means for Telegram. And what it signals about future moderation on social media platforms... and the limits of free speech.

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