How do I get all the users that have authorized my Facebook app?

There used to be an Authorization Callback, but I only see a Deauthorization Callback now.

So, what's the suggested way to store & get a list of users that have authorized the app?

This answer suggests to always add a u开发者_C百科ser to the list of app users.

Is that the best way?

I guess this can be done with the newly introduced insights feature, as mentioned in page the FQL Insights Documentation has a full list of metrics, and I guess what you need is:

• application_installed_users
  Available Periods: lifetime
  Total installations of your application or connections to your Connect application