Below url gaves the user\'s facebook page till yesterday. But it\'s not working anymore.
https://www.facebook.com/app_scoped_user_id/xxxxxxxxxxxxx/
Is there
https://developers.facebook.com/bugs/2054375031451090/
Subscribe to that bug to get updated on the status.
There is also a blog entry about this: https://developers.facebook.com/blog/post/2018/04/19/facebook-login-changes-address-abuse/ - so this is actually not even a bug.