The term appears as early as 1962 in Marshall McLuhan's The Gutenberg Galaxy.
[1] Many science-fiction societies are post-literate, as in Ray Bradbury's Fahrenheit 451, Dan Simmons' novel Ilium, and Gary Shteyngart's Super Sad True Love Story.
A post-literate society would have replaced the written word with recorded sounds (CDs, audiobooks), broadcast spoken word and music (radio), pictures (JPEG) and moving images (television, film, MPG, streaming video, video games, virtual reality).
A post-literate society might still include people who are aliterate, who know how to read and write but choose not to.
The nonfiction books Amusing Ourselves to Death by Neil Postman and Empire of Illusion by Chris Hedges both observe a sudden rise of post-literate culture.