Now, depending on reasons you want to logout, you might consider logging out of a (1) particular device or (2) All devices that have been used to access your Facebook account.
How Do I Log out of My Facebook Account? To log out from your current device, simply click on the V-like drop down button and select “Logout” at the top right hand corner of your Facebook page.
The Where You’re Logged In section of your Security and Login Settings shows you a list of devices and browsers that have been used to log in to your Facebook account recently.
Each entry includes the date, time and approximate location when logging in, as well as the type of device used to access your account.
To log out of Facebook on another computer, phone or tablet:
Go to your Security and Login Settings
Click on the ”Where You’re Logged In” section
Find the session you want to end and click ”End Activity”
Clicking End Activity will immediately log you off of Facebook on that computer, phone or tablet.