Open the Facebook app on your phone
Tap the menu icon (three lines) or your profile picture
Scroll down and tap Settings & privacy
Tap Settings
Scroll down and tap Accounts Center
Tap Password and security
Tap Log out
Confirm Log out
Open Facebook in a web browser
Click your profile picture (top right)
Select Settings & privacy
Click Settings
Click Accounts Center
Click Password and security
Click Log out
Confirm Log out
Log out of all devices (web or app)
Go to Accounts Center
Open Password and security
Select Where you’re logged in
Choose Log out of all sessions
Confirm Log out