I agree: it was the poster-like newspaper front page plus radio that became the media condition for the emergence of the "mass man" of Ortega y Gasset, what he observed in the 1920s in Spain and elsewhere in Europe, and the subsequent conversion of the mass man's self-entitlement into fascism.
Why front pages' headlines? Because paperboys shouted them in the streets, repetitively, much like heralds in medieval oral Europe. The mysterious, god-like voice coming out of radios in public places and homes added to this newly emerging and technologically amplified oral-tribal agitation of unity. ("Fascio": Italian "bundle, bunch, group")
In Europe, it was radio plus newspaper headlines for a just-emerging mass literacy with strong oral residues, leading the rise of fascism.
In Russia and China, it was radio plus newspaper headlines (dazibao in China) for a barely literate peasant culture that led them into communism. The medium of newspapers also served as the backbone of the revolutionary movement of the progressive lumpen intelligentsia (Lenin), just as it had 70 years earlier in Europe (Marx).
Funny fact: communism as an ideology emerged, and could only have emerged, in literacy. But as a political practice, it succeeded only in the oral cultures of peasant countries. Less funny: since literate cultures are now reversing into digital orality, formerly literate societies are becoming more susceptible to practical communism than ever before.
By the way, Orwell was wrong when he described Big Brother's hypnosis sessions delivered through the telescreen. He thought that, since he was describing an emerging fascist dystopia, a new medium—television—would be its vessel. No, television is a Huxleyan medium, not an Orwellian one. McLuhan wrote that Hitler would have lost his tribal magic immediately if he had appeared on TV. McLuhan also spoke a lot about how Nixon, more authoritative as an imaginary figure of radio and newspapers, lost to "cool" Kennedy in their famous TV debate.
Television cannot create an authoritarian dictatorship; it can create a consumerist society with a "manipulative" dictatorship manufacturing consent. The real medium of Big Brother would have been radio plus the front-page headline/poster/dazibao, the early forms of mass literacy.