Unblocking someone does not automatically make you friends again. You will have to send them a friend request. If you decide to add them back, they will get a notification that you sent a request , which implies you unblocked them previously.
Keep in mind that if you block someone and then unblock them, you cannot block them again for 48 hours . If you are trying to "peek" at their profile quickly and re-block them, you will be stuck unable to block them for two days.
When you unblock a person on Facebook:
Here’s a clear, detailed write-up answering the question:
No. Facebook does not send a notification when you unblock someone. will someone know if i unblock them on facebook
If you’re considering unblocking an ex, a former friend, or a coworker, here is exactly what happens and how they might eventually notice. Does Facebook Notify Them?
In older chats, the message "This person is currently unavailable on Messenger" will disappear. They may also notice they can suddenly send you messages again. Unblocking someone does not automatically make you friends
If you are asking about the official Facebook notifications, the short answer is .
To unblock someone on Facebook:
They will be able to see any of your posts that are set to "Public". Critical Rules of Unblocking
If you are tagged in a photo or post by a mutual friend, an unblocked person will be able to click on your name and view your profile. Keep in mind that if you block someone