Use the Facebook JS SDK in web app to improve login flow

[lindydonna]

The Facebook app shows this message when you first authorize: You are using a display type of 'page' in a small browser window or popup. For a better user experience, show this dialog with our JavaScript SDK without specifying an explicit display type. The SDK will choose the best display type for each environment. Alternatively, use display type 'popup' if you have special requirements precluding you from using the SDK. This message is only visible to developers of your application.

[ExperimentsAndIdeas]

Would love to have a sample that shows how to use the native FB SDK, instead of the JS SDK.

Reason is that it prevents credential prompting in iOS. (FB app, vs FB in settings, vs FB in browser/Safari)

[lindydonna]

The mobile app uses the native Facebook SDK, but you have to set up your login flow on the server. See https://github.com/azure-appservice-samples/ContosoMoments#authentication