When you block or restrict a friend from accessing your timeline, to reconnect with the persons, all you need do is to unblock.
– Open your Facebook application
– Click the menu bar on the bottom-right corner of the screen (iPhone) or on the top-right corner of the screen (Android)
– Scroll down to find and select Settings. This step is non-existent on Android devices
– Click Account Settings
– Select Blocking
– Click the Unblock button to unblock any user you wish to not block anymore
– Click the Unblock button
Interestingly, once you undertake the above steps accordingly, the user should be successfully unblocked.
Desktop
– Sign in to your Facebook account by visiting the Facebook website and entering your sign in details – Click the downward facing arrow on the top right corner
– Select Settings from the drop-down menu
– Click Blocking on the left side of your screen
– Click the Unblock button
Note that you will be asked if you’re sure you want to unblock the user and provided with the “Cancel” and “Confirm” option buttons on the bottom right corner.
– Click the Confirm button and you’re done with unblocking someone on Facebook.