A lot of people believe propaganda is complex & difficult. Nothing could be further from the truth.
A simple message, repeated a thousand times, is enough to create information pollution. Propaganda, marketing & advertising are the application of this principle. And people like Bernays & Goebbels understood this in the 1920s.
Interestingly, it is extremely hard to cut yourself off from that information pollution. Try counting the advertisements you see while walking down the street.