You should be able to see here that “truth” as defined here isn’t a matter of matching a story to reality, but just matching a story to its own retelling. This is, after all, how detectives trip up liars, by looking for inconsistencies in the stories they tell.
The Huffington Post Has a Fake News Problem!
Tim O'Reilly

Oxford University has released a tool for automated essay structure analysis that could help with the first iterations of “Truthrank”. As part of its analysis the tool looks at the connectedness of concepts through the body of the piece. Could this be applied to news stories? Would a factual story tend to a different structure than fake news? Would reporting have a different structure than editorial content?