Because of the Facebook outage, Telegram gained 3 million new users
Yes, 200 million is a lot, but not compared to the numbers of users of WhatsApp or Facebook Messenger. So why did Telegram pick up so many users in the last 24 hours? Though Durov didn’t explicitly state it, it’s easy to infer that his mention of “the last 24 hours” was a reference to all the trouble Facebook has had during that time period. Within the last day, Facebook has been plagued by outages of its most popular services, including Telegram competitors Facebook Messenger and WhatsApp.