I'm implementing Open Graph on website.
As mentionned on Facebook insights documentation, it's allowed to put meta like this one :
meta property="fb:page_id" content="your_page_id"
But the Facebook debugger tool showed an error :
Extraneous Property: Objects of this type do not allow properties named fb:page_id.
Other websites seems to have the same error like Mashable.com
In other hand, on another documentation page, the page administration seems to be only working with fb:admins and/or fb:app_id. But no mention of the fb:page_id.
So what the states of the fb:page_id meta on a website ?
The behavior you describe appears to be a bug. The issue has been submitted to Facebook and accepted:
http://developers.facebook.com/bugs/144705805635591/?browse=search_4f0323eb790c29273088132.
It has now been resolved.