These settings are provided in System Settings > General Settings > Sharing. The admin needs to enter ‘App Id*’ and ‘App Secret*’ to configure the Facebook post sharing feature. 

Fig. 1: Facebook Share and Earn Settings under Sharing tab (Admin-end) 

NB: Please note that if you have already created an App ID while setting up the Facebook login plugin, the same keys (App Id & App Secret) can be used to configure Facebook- Share and Earn Settings. 

Key Components: 

1. Login with Facebook for Developers and Create App
2. Access Keys
3. Testing Output at Front-end