Facebook

Visit https://developers.facebook.com/apps and create a new app (Consumer).

Visit https://developers.facebook.com/apps and create a new app (Consumer). Fill in any required details.
Go to App settings > Basic, copy the App ID & App secret, and add them to Admin > Settings > Social media.
Navigate to App > Facebook Login > Settings.
Copy the admin Callback URL and add it under Valid OAuth Redirect URIs in your Facebook app settings.