How to See Other Devices Logged Into Your Facebook Account
You logged into your Facebook account on your friend’s computer, and you’re not sure if you logged out. Or maybe you’re worried someone else has your password. Thankfully, Facebook tracks where you’re logged in, so you can see every device logged into your account, and end any sessions you don’t want active.
11 Jul 2017 ... To find out where your account is currently logged in, open a web browser, log into Facebook, and go to the Facebook account settings page.