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Facebook allows you to define custom objects within an app. Then you need to add a og:type metatag with the content "[namespace]:[custom_name]".
It would be really helpful having a way to add a custom type.
Also you can define extra properties on your objects that you need to define in your page as a metatag like <meta property="[namesace]:[property_name]" content="[property_contents]" />
. It would be great to add support to properties like these per node type.