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Use this godjango.com video:
https://godjango.com/13-django-social-auth-101/
It will give you a walk through of how to create social logins using OAuth. It uses GitHub in the video example. Within the django-social-auth package, you can find out how to install and use it here:
http://django-social-auth.readthedocs.org/en/latest/installing.html
For Facebook you need to look in the documentation or the package itself for the name of the access token. I will give it to you here just in case though. They are:
FACEBOOK_APP_ID and FACEBOOK_API_SECRET
In your settings.py you can set them up as so using environmental variables:
FACEBOOK_APP_ID = os.environ['FACEBOOK_APP_ID']
FACEBOOK_API_SECRET = os.environ['FACEBOOK_API_SECRET']
You need to get the actual APP_ID and API_SECRET through your Facebook account. You will want to use the developer Facebook site to create an App and then generate the API credentials. The web address for this is:
https://developers.facebook.com
Hope this helps. Put these together and you will have social logins for your web app.