Mainly, though, it was no single invention that marked the government’s effort so much as its massive scale and organization. In this, the British anticipated an insight that would be expressed by the French philosopher Jacques Ellul halfway through the twentieth century: to succeed, propaganda must be total. The propagandist must utilize all of the technical means and media available in his time—movies, posters, meetings, door-to-door canvassing in one century, social media in another, as the rise of ISIS attests. Where there is only sporadic or random effort—a planted newspaper article here, a poster or a radio program there, a few slogans sprayed on walls—this modern form of attention capture does not bear its once unimagined fruit.

Tim Wu, The Attention Merchants, loc. 146