Pavel Durov, billionaire founder and CEO of the Telegram messaging app, was arrested at the Bourget airport outside Paris on Saturday evening, TF1 TV and BFM TV said, citing unnamed sources. Telegram, particularly influential in Russia, Ukraine and the republics of the former Soviet Union, is ranked as one of the major social media platforms after Facebook, YouTube, WhatsApp, Instagram, TikTok and Wechat. Based in Dubai, Telegram was founded by Russian-born Durov.