A subversive option in Messenger messages
To date, Facebook does not allow its users to delete messages they have sent to Messenger. In short, what he writes does not write on Mr.'s social media. Zuckenberg.
Deleting the message he sent for personal reasons already exists as a possibility on Instagram, which is generally a more "liberal" network than Facebook, while the same possibility is given to Viber.
Now Facebook is taking the big step and trying to suspend messages experimentally with the option Unsend Message or Cancel Message with which the user will be able to cancel the existence of the sent message either because he made a mistake or because he regretted it.
So yes, in a little while we will be able to actually delete the message we sent to Facebook and I will tell them and they will give and take in our Messenger as well.