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FaceBook registartion



As I am having trouble setting up FB accounts for testing purposes, I am hoping someone here could help me find an answer to the following two questions:
1). How do I know if a user has registered using their FB account
2). How do I know if they have since changed/set a XenForo password

1). I assume that if $visitor['facebook_auth_id'] is set then they have done so?
2). Would grabbing 'scheme_class' be the way to do this?

Thank you in advance.