class CustomUserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        """
        Creates and saves a User with the given email and password.
        """
        print('creating user...')
        if not email:
            raise ValueError('Email must be set') #<--- Throws the error.
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email=None, password=None, **extra_fields):
        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password, **extra_fields):
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self._create_user(email, password, **extra_fields)

class CustomUser(AbstractBaseUser, PermissionsMixin):

    email = models.EmailField(
                              max_length=250,
                              unique=True,
                              )

    is_staff = models.BooleanField(
        _('staff status'),
        default=False,
        help_text=_('Designates whether the user can log into this admin site.'),
    )
    is_active = models.BooleanField(
        _('active'),
        default=True,
        help_text=_(
            'Designates whether this user should be treated as active. '
            'Unselect this instead of deleting accounts.'
        ),
    )
    date_joined = models.DateTimeField(_('date joined'), default=datetime.now)

    objects = CustomUserManager()

    REQUIRED_FIELDS = []
    USERNAME_FIELD = 'email'

    def get_short_name(self):
        "Returns the short name for the user."
        return self.email

settings.py

SOCIAL_AUTH_PIPELINE = (
    'social_core.pipeline.social_auth.social_details',
    'social_core.pipeline.social_auth.social_uid',
    'social_core.pipeline.social_auth.auth_allowed',
    'social_core.pipeline.social_auth.social_user',
    #'social_core.pipeline.user.get_username', <-- Comment this one out and use below instead to create the acc.
    'Eapp.facebook.creates' #<---
    'social_core.pipeline.user.create_user',
    'social_core.pipeline.social_auth.associate_user',
    'social_core.pipeline.social_auth.load_extra_data',
    'social_core.pipeline.user.user_details',
)

def creates(*args, **kwargs):

    print('##################################')
    print(args)
    print('##################################')
    print(kwargs)
    print('##################################')

No module named 'Eapp.facebook.createssocial_core'; 'Eapp.facebook' is not a package

SOCIAL_AUTH_PIPELINE = (
    'home.pipeline.[function_name]',
)