Identity Providers with Xamarin Forms and Azure

Hi guys,

I'm a bit confused about Identity Providers in a project I'm doing with Xamarin Forms.

I configured Facebook as an IP with Azure Mobile Apps following this page
https://docs.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-how-to-configure-facebook-authentication

It works, but my doubt is, how can I use the MobileServiceUser result of the authentication process to, for example, post to Facebook or get personal information from Facebook. Is this possible?

Thanks, I'm new in Xamarin and all this mobile world.