Facebook Social Authentication into CAM is broken.
The log state that the token coming from Facebook contains no user data.
Error: 0 : Authentication failed
System.ArgumentNullException: Value cannot be null.
Facebook have changed something which now requires a change to CAM to support the Facebook modification.
Product Defects: Defect ID: 700407 Defect ID: 772286
Defect 772286 - Awaiting fix in a future release