This is controlled by settings in the JFBConnect backend > Configuration area. If you have Automatic Registration set to 'No', the user will not need to enter a password if the "Password Field on Registration" field is set to 'Generate and Hide'. If you do have Automatic Registration set to 'Yes', then you should not be prompted for any information on log in via social network credentials.
-Melissa
why FB social login need to create new password?
