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Can't do Facebook integration

I fill in the "App Domains" field for my site's Facebook app and click save, but it returns the following message:

App Domains: [mydomain.com] should not contain protocol information.

How to solve this? Thanks.
^ I tried that as well, but then I just got another kind of error:

You have specified an App Domain but have not specified a valid integration URL.
mydomain.com must be derived from one of: Site URL, Mobile Site URL, Canvas URL, Secure Canvas URL, Page Tab URL or Secure Page Tab URL.