If you need to manage more than one Facebook Messenger account on an iOS device, we have good news for you. The company started supporting switching accounts in application her.
The feature was available on devices with Android since February, and allows you to add multiple accounts to the same application and switch between them.
The news will greatly delight webmasters, small business owners, public figures, or family members who share a single device.
The app update essentially makes Facebook Messenger available for all company platforms (Facebook, Messenger, and Instagram). So you can switch accounts without having to log in-log out.
When your application is updated, you will see the option in the Profile - Change Account box. There you will see the plus sign that allows you to add a new account. Good luck!