Create user inactive as default (is_active default False)

I have facebook authentication in my website which I use omab / django-social-auth

I want to redirect users to another website to make them fill their details. So I want to have users as inactive when they first authenticate with their facebook accounts, then after they complete the form I save them as active users.

I manipulated the django/contrib/auth/models.py under my enviroment as with is_active fields as default=False; but they are saved as active user but still the same result, even I add a normal user from the admin panel. Is there something I am missing?

class User(models.Model):
    """
    Users within the Django authentication system are represented by this
    model.

    Username and password are required. Other fields are optional.
    """
    username = models.CharField(_('username'), max_length=30, unique=True,
        help_text=_('Required. 30 characters or fewer. Letters, numbers and '
                    '@/./+/-/_ characters'))
    first_name = models.CharField(_('first name'), max_length=30, blank=True)
    last_name = models.CharField(_('last name'), max_length=30, blank=True)
    email = models.EmailField(_('e-mail address'), blank=True)
    password = models.CharField(_('password'), max_length=128)
    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=False,
        help_text=_('Designates whether this user should be treated as '
                    'active. Unselect this instead of deleting accounts.'))
    is_superuser = models.BooleanField(_('superuser status'), default=False,
        help_text=_('Designates that this user has all permissions without '
                    'explicitly assigning them.'))
    last_login = models.DateTimeField(_('last login'), default=timezone.now)
    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
    groups = models.ManyToManyField(Group, verbose_name=_('groups'),
        blank=True, help_text=_('The groups this user belongs to. A user will '
                                'get all permissions granted to each of '
                                'his/her group.'))
    user_permissions = models.ManyToManyField(Permission,
        verbose_name=_('user permissions'), blank=True,
        help_text='Specific permissions for this user.')
    objects = UserManager()


 def create_user(self, username, email=None, password=None):
    """
    Creates and saves a User with the given username, email and password.
    """
    now = timezone.now()
    if not username:
        raise ValueError('The given username must be set')
    email = UserManager.normalize_email(email)
    user = self.model(username=username, email=email,
                      is_staff=False, is_active=False, is_superuser=False,
                      last_login=now, date_joined=now)

    user.set_password(password)
    user.save(using=self._db)
    return user

1. Avoid modifying built-ins. There are better ways to do things.
2. Like signals. Signals are awesome.
3. In this case, I'd attach to the pre_save signal of django.contrib.auth.models.User, and manually correct the is_active property of the model instance (if the object is new).
4. This way, you can add some logic to make sure you're properly marking a user as not active.
5. Because user's added within the Admin should probably be active, if the admin marks them as active.