The arrest of Telegram’s CEO Pavel Durov is bringing fresh attention to criminal activity on the app. According to law-enforcement officials and cybercrime researchers, Telegram has become the premier internet platform to buy everything from hacked data and weapons to illicit drugs and child sexual abuse material. WSJ reporter Angus Berwick joins host Zoe Thomas to discuss how Telegram became the successor to the darknet and what it's like to find your personal data for sale on the app.

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