Facebook Social App User Guide
To follow these steps you will need a Facebook account. If you don't have one you can sign up at the link:
To create a custom app Facebook requires that you validate your account, adding at least one mobile phone. You can do this accessing your settings page at the Mobile tab:
Add a New App
Access Facebook for Developers page (If you don't have an account you will be requested to create one):
Click on "Add a New App" and choose your Custom Facebook Application's name.
Add the Facebook Login to your application clicking at "Set Up".
Select Web type and fill the Site URL with your website URL.
Save Changes and, at Side Bar Menu, click on Facebook Login Settings and add Social-ID OAuth URI as a Valid OAuth Redirect URI:
When asked at Social-ID, provide your App ID and App Secret, found at Settings > Basic:
Create Custom Social Login App
Access your marketing account at https://app.socialidnow.com/. Open the drop-down of your account and click on "Social Apps"
Click on "Add a new Social App" and select Facebook type.
Choose a name for your Social App and provide the Facebook Login App ID and App Secret. At this point, you can request permissions to which information you want to capture from Facebook when users log in using your Social App. When all set, just click on "Create the Social App" to get your Custom Facebook Social App.