# Microsoft.AspNetCore.Authentication.Facebook

``` diff
 {
-    namespace Microsoft.AspNetCore.Builder {
 {
-        public static class FacebookAppBuilderExtensions {
 {
-            public static IApplicationBuilder UseFacebookAuthentication(this IApplicationBuilder app);

-            public static IApplicationBuilder UseFacebookAuthentication(this IApplicationBuilder app, FacebookOptions options);

-        }
-    }
 }
```

