TechCrunch reports that Canadian marketing professionals can expect to have the ability to unsend message for the first 10 minutes after you hit the send button soon, and notes that a “tombstone” will be left indicating a message was retracted but Facebook will retain unsent messages for a short period of time so if they’re reported, it can review them for policy violations.
As at December 19th I have this functionality on my computer by clicking on three dots beside the message but do not see it on Android. Not sure about iPhone.
WORK WITH SUE