Where is user data requested via the Facebook API stored?

Question

Facebook

Created an application for FB. The application asks for user data during authorization. The user creates a photo through the application.
Now we need to upload a list of users who have published photos through this application.
Question: how to find a list of these users, if at the initial stage this criterion was not taken into account during development?
I check the following options:
- use their application api: https://developers.facebook.com/docs/graph-api/ref... specifically - the subscriptions resource (/app_id/subscriptions) and see what it returns
- there is a possibility that it returns a list of users and their permissions in the application. if so, then you can make a selection by filtering out from this list those users who gave permission to post photos in their application
- if it doesn’t work out, you can go hardcore and try to pull the data through fql ( https://developers.facebook.com /docs/reference/fql/), but it’s not at all a fact that they are there or that Facebook will give them through this interface