Here is a client account with 3 ads in one audience and messages as the campaign objective.
2 of the 3 ads are getting messages and had the same caption (a story).
The difference between the two is simply a picture taken with a phone vs. a flyer version of that same picture.
The results?
The one taken with the phone and just the story caption is performing the best and 2x better than the exact same picture but with the flyer.
What have you been testing and planning to test this week?