WhatsApp's rival, Telegram, registered 70 million new users during Monday’s Facebook blackout, the app's founder, Pavel Durov wrote on his Telegram channel. The app soared 55 spots on Monday to top the US iPhone download chart, according to Sensor Tower, an app intelligence company. This is by far the biggest surge Telegram has ever seen. “I am proud of how our team handled the unprecedented growth because Telegram continued to ...