Authenticating with Facebook, Google, and Twitter
Adding new social strategies is very similar to what we did with the local strategy. The main difference with the social strategies is that we need to register our app on each of the platforms, and of course, have an account on each one of them.
We need to go to the Facebook Developers site (https://developers.facebook.com) to register the app. Go to My Apps | Settings | Basic, and get App ID and App Secret. We also need to the site URL to http://localhost:9000/.
In case you need to set up the callback URL you can use http://localhost:9000/auth/facebook/callback.
Once you have the ID and secret, ...
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