Below are the instructions on how to logout of Facebook Messenger on iPhone:
Open Facebook on your iPhone
Then Tap on the Hamburger Menu
Now tap on Setting and Privacy
Tap on Security and Login
Now you can see some device name under the ‘Where you logged in’
Tap on Three vertical Dots and then click on Logout
Read More: https://onlinegeeks.net/log-out-of-facebook-messenger-on-android-ios/
No friends.