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How do you link to a Facebook Page in a comment using its PageId? I remember it was something like:
@[id:linkname] will work if you know the Facebook Page ID.
You can just use @Page Name now. You can encapsulate it in [ ] if it's a rather long one, but there will be an auto-complete-type list that appears underneath. You don't need to have "liked" the pages you're trying to reference in a comment or post.