If you have actually obstructed somebody unintentionally or changed your mind about the block, though, it is likewise reversible. You can alter your Privacy settings to unblock and allow someone back into your Facebook world.
How To Unblock People 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 "Unclog" link next to the name of the individual you wish to unclog. A list of individuals you have actually obstructed is discovered under the Block Users area.
Tip
Uncloging someone does not immediately put that individual back in your buddy list. You should include the newly unblocked person as a pal and wait for them to confirm the request.
And one more thing please don’t forget to share this awesome trick to use the How To Unblock People On Facebook with your friends.