The world’s most popular messaging app appears to have stopped working, potentially affecting billions of users.WhatsApp is the biggest chat platform in the world, with more than two billion monthly active users, and the third biggest social platform after Facebook and YouTube.Register for free to continue readingRegistration is a free and easy way to support our truly independent journalismBy registering, you will also enjoy limited access to Premium articles, exclusive newsletters, commenting, and virtual events with our leading journalistsAlready have an account?sign inBy clicking ‘Register’ you confirm that your data has been entered correctly and you have read and agree to our Terms of use, Cookie policy and Privacy notice.This site is protected by reCAPTCHA and the Google Privacy policy and Terms of service apply."