The note mentions the option to remove a message from a chat thread after being sent.
Now Facebook is planning to save Messenger users from some of this pain. It'll only let you unsend messages for up to 10 minutes after you first send them. That feature will be extended to the rest of the world according the list of "Coming Soon features". At least, that's how its worked for users whose name isn't Mark Zuckerberg.
One of Gmail's best features is the ability to unsend emails.
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Compared to Facebook other messaging application, you'll actually have significantly less time to delete a sent message in Facebook's flagship Messenger app. WhatsApp users are now afforded just over one hour to remove a message from both users' inbox. It's unclear at this time whether the feature will work both on mobile and on desktop, but it would make sense for Facebook to offer the same messaging experience across platforms.
Right now you can delete messages but it only will delete the message on your end and not the recipient's end.
At the time of the discovery, when editing messages already sent in a conversation, the "Unsend Message" option will appear.