The first was radio and television. Humans around the world spending a significant portion of their waking hours consuming audio and video recordings of other people.
The second was the internet. Five to ten hours a day interacting, in real time, with other people, many of them strangers.
And the third is AI. We’re about to spend almost all of our time interacting with software that appears to have an understanding of us and the world around us. All the time, in real time.