Best way to use Facebook as site membership system, asp.net mvc 3, using Facebook C# SDK?

Here's how I currently use the Facebook C# SDK, with Facebook Javascript SDK (this is from memory, but I think it's accurate psuedo-code):

FbApp = new FacebookApp
Is FbApp.Session null?
  No - they're logged into Facebook, pull profile from DB
    Is profile null?
    Yes - they aren't a member, ask for permission then save their FacebookId, Name, and Email
    No - they're a member
  Yes - they're not logged into Facebook

That's really about it. But reading through the tutorial here, I'm wondering if I'm doing something the wrong way? Or a "bad" way? I've been using it th开发者_StackOverflow中文版is way for around 3 months without issue.

I've read others having issues with Facebook changing their authentication API's, but I've never had any hiccups. The Facebook C# SDK has been updated a few times sine I started using it, but I haven't upgraded yet.

Just want to be sure, what I'm doing is ok or am I heading for a "train wreck"?

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The best way I think is to understand the Facebook API yourself ( http://developers.facebook.com/docs/reference/api/ ) . Using library will help you but it will make you dependent with the library. Facebook is famous for its frequency of changing API. So depending entirely on a library will likely make your job more stressful ( worse if the library took long to update).

Just my 2 cents