I have an application which wanting to show the statistics about a friend who got tagged in a photo. The outcome seems odd.
e.g. I have a friend A. A is a friend of B but B isn't my friend. B has a photo and tag A to his photo. When my facebook application runs, I cannot see how many tagged photo applied on A. Is it because B is not my friend so I can't see A got tagged. Even when A tagged himself on B's photo, I still can't see the photo_tag of A.
I can query the photo_tag of user A if the photo owned by A either tagged by A or B.