WhatsApp, the most popular messaging service, revealed today just how big it has become. From a report: The Facebook-owned app said it has amassed two billion users, up from 1.5 billion it revealed two years ago. The announcement today makes WhatsApp the only second app from Facebook to join the two-billion-users club. (Facebook’s marquee app has 2.5 billion users.) In an earnings call late January, Facebook also noted that that there were 2.26 billion users that opened either Facebook, Messenger, Instagram, or WhatsApp each day, up from 2.2 billion last quarter. The family of apps sees 2.89 billion total monthly users, up 9% year-over-year. WhatsApp, founded 11 years ago and sold to Facebook for $19 billion six years ago, took the opportunity today to reiterate how committed it is to providing end-to-end encryption to its customers all over the globe — a crucial feature lauded by security experts everywhere but something that many governments are increasingly trying to contest. “Strong encryption acts like an unbreakable digital lock that keeps the information you send over WhatsApp secure, helping protect you from hackers and criminals. Messages are only kept on your phone, and no one in between can read your messages or listen to your calls, not even us. Your private conversations stay between you,” WhatsApp wrote in a blog post.