get list of facebook users who are using specific application using FQL

Question

I am trying to fetch following case using FQL

If few users have authorized \"Application A\" then is it possible to know that currently how many users are using tha

Answer 1

You can't get a listing of your application's users from the API. If you need this, you should maintain your own database of users and reference that.

You can also check if any particular user is a user of your application by requesting /USER_ID/permissions?fields=installed with your application access token.

You can also check if a user's friends are users of your application by requesting the same field on the friends connection (for example, /USER_ID/friends?fields=installed). In this case, the USER_ID must be a user of your application or you won't be able to access their friends list.