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