Hi there is a problem when using the Facebook login when running the site as a Facebook application using Internet Explorer
i.e. Setup the app at https://developers.facebook.com/apps.

When you run the app and login, it does not work because the cookie is deleted. There are some google posts saying to play with the p3p header which I tried but did not work

The website app address is https://apps.facebook.com/selectsystems

Because I am testing and have not got a proper SSL certificate
So go to this address first https://www.selectsystems.com.au/facebook/shop/
Once you approved SSL then go to https://apps.facebook.com/selectsystems/
and try to login using Facebook

You can see the login page image here at http://www.selectsystems.com.au/examples/SSLogin.jpg

One suggestion was to use Cookieless session for the iframe case see http://msdn.microsoft.com/en-us/library/aa479314.aspx but I have not tried that yet

Has anyone had any luck with solving this login problem ?