When you unblock someone, that person will be able to see your posts on Facebook that you share with the public. The person won’t automatically become your friend on Facebook. If you want to become friends with a person who you’ve unblocked, you’ll need to send them a friend request.
How To unblock someone Through Your PC
Click (?) in the top right of any Facebook page
Click Privacy Shortcuts
Click …see more privacy settings
Click blocking at the left column of the page that appears
Click Unblock next to the name of the person you want to unblock.
What is blocking and how do I block annoying Facebook Friend?
When you block a Facebook friend or an external stalker they will no longer be able to do things such as tag you or see things you post on your Timeline. If you’re friends, blocking them will also unfriend them.
How to block friends or people who are bothering you on Facebook
Click (?) at the top right of any Facebook page.
Click …see more privacy settings
Click blocking at the left column of the page that appears?
Enter the name of the person you want to block and click Block
Select the specific person you want to block from the list that appears and click Block again
Note that Facebook friends will not be notified when you block them.
If you can’t find someone using this method, try going to the person’s profile and selecting Block from the menu on their cover photo.
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