Deleting Messages From the Facebook iOS App

If you have messages in your Facebook inbox, I've got the technique to delete them using VoiceOver.

Go to your messages area on Facebook for iPhone application. When you swipe to a message, instead of double-tapping, double-tap and hold for a few seconds. You can move your finger if you wish, a little window will come up. Double-tap on "confirm deletion for ".

Good luck!