We need something akin to the simplicity and ubiquity of Google that does this, government funded and with transparent oversight. We're past the point of your aunt needing a way to quickly check if something is obvious bullshit.
Call it something like Exx-Ray, the two Xs mean double check - "That sounds very unlikely that they said that Aunt Pat... You need to Exx-Ray shit like that before you talk about it at Thanksgiving"
Or same thing, but with the word Check, CHEXX - "No that sounds like bullshit, I'm gonna CHEXX it... Yup that's bullshit, Randy."