Now that we know the mechanics, let's talk about the human side.
If a mutual friend tags you both, they will see your name. 🛠️ How to Unblock Someone on Facebook
You must send a new friend request to reconnect.
Use it wisely. And for the love of social media, do not unblock them at 2 AM. Sleep on it. The 48-hour clock will still be there in the morning.
When you unblock someone, the following restore automatically: