I am building an application in ASP.NET MVC 3 in which I have implemented Forms authentication.

I would also like to give the user the option to Sign-up/log-in with their facebook account(and possibly other social accounts in the future.)

I am using the [C# Facebook SDK](http://facebooksdk.codeplex.com/)

I have successfully implemented the facebook login workflow. Now my question is, how to handle mixing both Forms and Facebook Auth? I can't seem to find any sufficient examples of how to accomplish this.

In regards to my facebook implementation, I am requesting permission from the user for a non-expiring Auth Token which I will store in my database.