We can credit these years, the mid-1950s, with the achievement of “peak attention.” By that, I mean something quite specific. A historic anomaly, unprecedented and eventually to dissolve, this was the moment when more regular attention was paid to the same set of messages at the same time than ever before or since. The phenomenon resulted from a confluence of the prime-time ritual, the novelty of television, and industry concentration—all combining to create within the Free World the routinely massive audiences previously possible only in fascist and communist regimes. Peak attention would continue through the 1970s, with CBS, NBC, and eventually ABC taking turns at winning the big prize of nearly 60 or 70 million viewers at a time. Nevertheless, the peak of peak attention can be assigned an exact date: Sunday, September 9, 1956, when Elvis Presley made his first appearance on television, on CBS’s Ed Sullivan Show. Its 82.6 percent share of viewers (out of a U.S. population roughly half of today’s) has never been equaled or bettered.

Tim Wu, The Attention Merchants, loc. 453