That would only measure public content. A large portion of US users have stopped engaging with public content on FB. A lot of people want to use FB to communica

That would only measure public content. A large portion of US users have stopped engaging with public content on FB. A lot of people want to use FB to communicate with loved ones and news is just shoehorned in awkwardly. They don't engage with public content because either because it got them put in timeout or because they realized it was like shouting at a brick wall It's not surprising that the ones that still engage with public content are people you could imagine enjoying shouting at walls.