If you use Facebook Messenger, which you probably do, then you'll want to make use of the new secret messages features which uses encryption. Here's how to use Secret Conversations on Facebook Messenger. See: 15 Facebook tips and tricks.

Facebook has finished rolling out Secret Conversations to all of its 900 million Messenger over recent weeks. The feature allows users to encrypt messages so no one else can read them (except those in the conversation), not even Facebook or law enforcement can read them. It's available on iOS and Android.

Find out how to stop Facebook auto-playing videos.

How to send secret messages on Facebook Messenger

•    Update the Facebook Messenger app if you don't have the most recent version
•    Tap the 'i' icon in the top-right of the screen
•    Select Secret Conversation from the list
•    Choose 'Turn On'

It's pretty easy and so it should be. One thing to note is that once it's switched on, the device you're using will be the only one which you can use to send and receive messages with. You need to enable it for each specific conversation rather than a global setting for all of Facebook Messenger. Secret conversations have a padlock icon by the person's profile picture.

The feature also allows senders to send messages with a Snapchat-style expiration time ranging from five seconds to one day.

Read next: Best new phones coming in 2017