Facebook is a powerful tool and great way to keep in contact with friends and family. However, it does have its downsides and you might have blocked people when they get a little too annoying. If you want to reverse that decision, here's how to unblock someone on Facebook. See also: How to delete comments on Facebook, Twitter, Google+, YouTube and more.
Before you being the process it's worth noting that unblocking someone will not automatically add the person back to your friends list. If you want to become friends with this person again, you'll need to send them a new friend request.
In future, an easier way of not seeing someone's annoying posts is to unfollow them rather than blocking them. To do this, untick the following box within the cover photo area of their profile. Read: How to use Facebook's Privacy Check-Up tool and unfriend people.
How to unblock someone on Facebook
Click the padlock icon in the upper-right corner of your homepage and select 'How do I stop someone from bothering me?'.
Now select 'View All Blocked Users'.
Click the 'Unblock' button next to the name of the person you want to unblock and confirm in the next box. You've now unblocked that person and can optionally send them a new friend request.