Facebook backend names about social-docs

[shivan-s]

Hi @ei-grad, I agree. The docs aren't really clear on this matter. Even the backend specific docs: https://python-social-auth.readthedocs.io/en/latest/backends/index.html

I did find sample code in the repo: https://github.com/python-social-auth/social-examples/blob/master/example-django/example/settings.py

So for facebook, we have two options (appOAuth2 or just OAuth2):

AUTHENTICATION_BACKENDS = (
    ...
    'social_core.backends.facebook.FacebookAppOAuth2',
    'social_core.backends.facebook.FacebookOAuth2',
    ....
)

Hope that is useful.