There may be some truth in Bernays' statement about the power of motion pictures. However, today perhaps they can't be called "the greatest carrier of propaganda" so much as "a major" carrier. In 1928, television had not been invented yet and the internet wasn't even a twinkle in the eye of technology. Today, t.v. is a major source for learning our social cues with programming targeted to audiences as young as babies (literally). The internet also has a major influence on our perceptions of society.