Question:

How can I know if a user has changed his profile information, such as his name and email address?

 

 

Answer:

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You can implement the real-time update feature in your application and subscribe to the user information that you want to monitor. Once the user changes the relevant information, Facebook will then send change notification to your application.

For details, please see Facebook documentation on real-time updates.

I have also written a set of tutorials for real-time updates.

 

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