https://www.cnet.com/news/unsend-facebook-messenger-gives-you-10-minutes-to-take-that-typo-back/

Facebook says the feature will help you get past those times you accidentally sent a message to the wrong group of friends, mistyped something or "simply wanted to remove a message."

It was uncovered that Facebook was testing the feature in October 2018, and it's already been available to users in some countries, including Poland, Bolivia, Colombia and Lithuania.