Over a billion people communicate through Facebook Messenger every day. While Facebook says it takes measures to keep users’ information private, how secure are those billions of messages really? Here, Facebook shares information on how some of its security works, while Vyas Sekar, a faculty member of CyLab at Carnegie Melon University and a professor of Electrical and Computer Engineering, breaks down how someone might still find ways around it. What security measures does Facebook Messenger take? Facebook’s Messenger feature and app already include a fair amount of security.