A Times investigation has found that Telegram, one of the world’s biggest messaging apps, with nearly a billion users, is also a giant black market and gathering place for the likes of terrorists and white supremacists.

Adam Satariano, a technology reporter for The Times, discusses the story of Telegram and the arrest of its founder, Pavel Durov.

Guest: Adam Satariano, a technology correspondent for The New York Times.

Background reading:

• How Telegram became a playground for criminals, extremists and terrorists.
• The criminal charges against Pavel Durov raised concerns in Silicon Valley about encryption and Telegram’s approach to privacy and security.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.