I have an App with close to a million installed users. But as the user base grew, I failed to store the user IDs who installed my app in my database. Now I am alarmed to find that Facebook API offers no direct method to do that. How do I go about finding the users who installed my app now?
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How do I go about finding the users who installed my app now?
By saving their ID next time they actively use your app.
No, there is no other way.

CBroe
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I am wondering if there's a way to go about iteratively testing all userIDs to see if they have my app installed? Will this be against Facebook Developer ToS? – Man_Pat Dec 20 '12 at 09:08