How to get all the user IDs of people who are using your Facebook application

Question

Is there a way to get the user IDs of all the people who are using your Facebook application?

Answer 1

Just a little more on this - I managed to find a lot of the userIDs I was looking for by doing basic Graph API searches and then checking they were valid with my app.

Search an email address or username here:- https://developers.facebook.com/tools/explorer?method=GET

QUERY: https://graph.facebook.com/search?q=user@email.com&type=user

If you get a match or more than one, you can check it is valid as install on the FQL query button of the same explorer:-

SELECT uid FROM user WHERE uid = *USER_ID_TO_SEARCH* AND is_app_user = 1

If it appears as a uid, you're good - they're valid. This helped me get to what I needed (when I hadn't got some of my app users info on signup).