Blocking someone on Facebook Messenger is a definitive way to cut off communication. However, relationships change, mistakes happen, and sometimes you may need to reverse that decision.

If you are working on a laptop or desktop, you must use the main Facebook website. The dedicated Messenger website (Messenger.com) generally redirects you to the main Facebook settings for blocking actions.

Note: Unblocking doesn't automatically restore past messages or re-add them as a friend on Facebook — you may need to send a new friend request separately.

To (Facebook Messenger):