Enabling the Facebook Login option, a Facebook Login button will appear on the Classic Hotspot Splash Page.
The login process is automatically configured and operative, as Facebook communicates with the internal "Access Internet" application.
HOW TO CONFIGURE FACEBOOK LOGIN
STEP 1
Access to the Splash Page Editor >> Click on the "+" on the top-left of the Editor, drag and drop a login button
By default, it will be Facebook Login
STEP 2
Customize text and style of the button from the right menu

STEP 3
In Advanced Settings enable the "Require Social Action to navigate" if you want configure Facebook Social Action
Facebook social actions overview

Enable the "Ask to fill custom form to complete login" option if you want enable the incremental authentication with pre-filled fields in Custom form
Incremental authentication with pre-filled fields (Social and Form login)

DATA COLLECTION
Depending on the user's privacy settings and available information, you can collect the following data, available on the Social Dashboard:
LOGIN PROCESS
SCREEN 1
The user clicks on the button in the Splash Page

SCREEN 2
Facebook asks for permissions

In this stage, user can choose to provide his personal data, or not, editing the info provided.
INFO
Remember to enable facebook social icon on Spash Page, for details check Social Login overview otherwise the Facebook login will fail.
Related Article:
Facebook social actions overview