this article takes a very limited view of propaganda. the vast majority of material that the average human is exposed to on a daily basis could be considered to be propaganda.
All my sources say that the earth is a geoid rather than flat, and that's not propaganda.
I really lament the fact that so many people have never moved past the "nothing is really knowable" stage of epistemology. That, and the middle-ground fallacy.
"Believe half of what you see and nothing that you hear"