How to Log Out of Facebook on Every Device you are Logged into Using your iPhone?br br Step 1: Open 'Facebook' App, and then login to your facebook account.br br Step 2: Tap on 'Menu' icon at the bottom right.br br Step 3: Scroll down at the very bottom, and then tap on 'Settings & Privacy' link.br br Step 4: Tap on 'Settings.'br br Step 5: Tap on 'Security and Login' under 'Security' section.br br Step 6: Tap on 'See all' link next to 'Where you're logged in.'br br Step 7: Tap on 'Log Out of All Sessions,' and then tap on 'Log Out' button again.br br br It's done.