How Do I Unblock Someone

How do I unblock someone I have blocked?

Android: "..." in the top, right hand corner of your screen > Settings > Scroll down to Blocked Profiles > Find the profile you want to unblock and tap unblock. A menu will then appear for you to be able to unblock that profile.

I blocked someone by mistake and want to undo that block.

How do I unblock someone on Facebook Android?

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How To Unblock Someone In Facebook App On Android - YouTube