u/InspectorPositive543

My wife goes on Instagram and will see posts where some delicious food, like ice cream or tacos, etc, is shown. Eventually a letter is shown and there will be text saying someone whose name starts with the shown letter owes you the depicted food. It almost always shows the first letter of my name. I think there is some sort of information sharing going on and she believes it is random. To me, it happens far too often to be random. Does anyone know how these posts work?