Follow the step below to unblock someone on Facebook
- Click the padlock symbol in the top right of Facebook and select How do I stop someone bothering me?
- Then click View All Blocked Users.
- Click Unblock next to the name of the person you want to unblock.
Note; Unblocking this person won't automatically add them back to your friends list. If you want to become friends again then you will need to send them a new friends request by going to their profile and clicking add friend.
If you would like to know how to block someone on Facebook read How Do You Block Someone On Facebook