All answers to my question lead to a year old document (http://msdn.microsoft.com/en-us/library/windowsazure/gg185919.aspx) which is not correct anymore - the section "To obtain a Facebook Application ID and Facebook Application Secret" describes the process than cannot be used on today's Facebook site for developers.
I am hoping that someone who has Facebook experience can get me the "current version" of this 7 steps long process described as:
- Create a Facebook account at http://facebook.com
- Navigate to http://www.facebook.com/developers/ (my note: this is wrong - the url should be developers.facebook.com)
- On the Facebook | Developers page, click the + Set Up New Application button, and then follow the instructions. (What instructions)
- On the Facebook | Edit <> page, click the Web Site link on the left. (No such link)
- Copy Application ID and Application Secret. You will use these when you configure Facebook as an identity provider on the ACS Management Portal in the next step
- Specify your fully qualified domain name (FQDN) URL to your namespace, including the leading HTTPS. Your namespace will be different.
- Click the Save Changes button
The step 6 is the biggest problem - it is the insertion of Azure ACS specific information into Facebook's world and was not able to find the field on Facebook App form creation where this belongs to. Obviously, I do not know anything about Facebook's app creation.