If you unblock someone and immediately regret it, you cannot block them again right away. Facebook enforces a waiting period. Once you unblock someone, you must wait 48 hours before you can block them again. Make sure you are certain about your decision.
Unlike adding a friend, which is done front-and-center on a profile, unblocking is tucked away in the settings menu. Here is your step-by-step guide to reversing the digital ban. how to unblock people on fb
To unblock someone on Facebook, you must navigate to your settings, where a full list of restricted profiles is maintained. Once unblocked, the person can see your public posts but will not automatically become your friend again—you'll need to send a new friend request if you want to reconnect. Unblocking on Mobile (Android & iOS) If you unblock someone and immediately regret it,
: A pop-up will appear explaining the consequences. Tap Unblock again to confirm. How to Unblock People on Facebook Desktop Make sure you are certain about your decision