https://www.theguardian.com/technology/2019/feb/06/facebook-messenger-users-10-minute-unsend-window-zuckerberg

Version of feature that Mark Zuckerberg was caught using is now available to all

Facebook is launching an “unsend” feature in Messenger more than 10 months after it promised to do so after it was discovered surreptitiously removing messages sent by Mark Zuckerberg from their recipients’ inboxes.