https://www.cnet.com/news/facebook-messengers-unsend-feature-is-coming-soon/

"Coming soon: Remove a message from a chat thread after it's been sent. If you accidentally send the wrong photo, incorrect information or message the wrong thread, you can easily correct it by removing the message within ten minutes of sending it," it wrote.

This follows a security researcher revealing that the company was prototyping the feature in October.