Ad Fontes rates the news for reliability and bias. We's on a mission to positively transform media and society. Ad Fontes Media is incorporated as a Public Benefit Corporation (PBC) in Colorado. The stated public benefit of Ad Fontes Media is tthe same as its mission. Ad Fontes is Latin for “to the source,” because at the heart of what Ad Fontes Media does is look at the source—analyze the very content itself—to rate it.