If you have actually obstructed somebody accidentally or changed your mind about the block, though, it is likewise reversible. You can alter your Privacy settings to unclog and permit someone back into your Facebook world.
Can I Unblock A Friend On Facebook
1. Click the down arrow next to "Account" on top right of any page on Facebook.
2. Click "Personal Privacy Preferences" from the Account menu.
3. Click the "Edit Your Lists" link under the Block Lists heading. It is at the bottom center of the page.
4. Click the "Unblock" link next to the name of the person you want to unblock. A list of the people you've blocked is discovered under the Block Users section.
Idea
Unblocking somebody does not instantly put that individual back in your friend list. You should include the newly unblocked person as a buddy and wait on them to validate the demand.
And one more thing please don’t forget to share this awesome trick to use the Can I Unblock A Friend On Facebook with your friends.