Do we need to pass the data (like age, gender, country) if yes then how?
or it itself captures all user data?
I have implemented it in web rather than in any app. Provide solution according to it. Thanks in advance :)
No you don't need to pass anything to view demographics in Facebook Analytics for Apps. However, you need to have a minimum number of users in a given report view to see demographics. More information here: https://www.facebook.com/help/analytics/1830887110468299