This seems like a broader, more ambitious version of Snopes. If successful, I wonder would it replace it? Or could this be something Snopes could expand its existing community to handle?
Snopes is a great model for why this will fail, though. They'll be dismissed as "fake news" by one side or another on anything controversial.
Hell, I've seen folks met with offended "did I ask for criticism?!" responses when they drop a "no, Bill Gates isn't going to give you a million dollars for forwarding that chain email" Snopes article in someone's Facebook comments.