Browsed Facebook from a friend’s phone and forgot to log out?,Well don’t worry you can remotely log out from Facebook follow the steps
Goto Facebook and login with your username and password
Goto account settings,there you will find options like’login notifications’,’where you logged in’
Click the last option ,you will see a list of devices you are currently logged in
End all the activities.
Done you will be signed out from all other active logins