If you have recently browsed Facebook on a public network or noticed suspicious activity on your account, you can easily check what devices you are currently logged in on. If you feel you need to secure your account, you can log out of Facebook from every device in addition to resetting your current password. In this article I will show you exactly how you can do that.
Log in to your Facebook account and navigate to Account > Settings & privacy.
Switch to the Security and login tab.
This is where you can see all the devices you are currently logged in on. Click See more.
Click Log out of all sessions.
Click Log Out once the confirmation window appears.