Shh! Facebook quietly rolled out an update to the Facebook Messenger app that enables “end-to-end encrypted,” “Secret” messages!
This means that message content will remain completely private outside of the people involved in the conversation, making it ideal for sending sensitive information from one person to another. It also includes a feature that allows you to set an expiration for your messages, meaning that your messages can
literally self-destruct, Inspector Gadget-style.
This makes Facebook Messenger an extra-secure contender to apps that offer similar services like WhatsApp (which is owned by Facebook) and Snapchat.