A case was opened last month to investigate child pornography, drug sales, fraud and other criminal activities on the platform. The app’s founder, Pavel Durov, was detained over the weekend near Paris. Instant Messaging, Mobile Applications, Social Media, Computers and the Internet, Freedom of Speech and Expression, Child Pornography, Drug Abuse and Traffic, Money Laundering, Telegram LLC, Durov, Pavel Valeryevich (1984- ), Macron, Emmanuel (1977- ), France A case was opened last month to investigate child pornography, drug sales, fraud and other criminal activities on the platform. The app’s founder, Pavel Durov, was detained over the weekend near Paris. NYT > Business