If you have actually obstructed someone mistakenly or changed your mind about the block, however, it is likewise reversible. You can change your Privacy settings to unclog and allow someone back into your Facebook world.
How To Unblock A Friend On Facebook
1. Click the down arrow next to "Account" at the 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 beside the name of the person you desire to unblock. A list of individuals you have actually blocked is found under the Block Users area.
Tip
Uncloging someone does not immediately put that individual back in your pal list. You should include the recently unblocked individual as a buddy and wait for them to validate the request.
And one more thing please don’t forget to share this awesome trick to use the How To Unblock A Friend On Facebook with your friends.