Good one. For an even earlier history, one should read 'The Friendly Orange Glow: The Untold Story of the PLATO System and the Dawn of Cyberculture' by Brian Dear. The author spent decades researching and interviewing the pioneers. The PLATO system had chat rooms, instant messaging, screen savers, multiplayer games, flight simulators, crowdsourcing, interactive fiction, emoticons, e-learning (like MOOCs) etc.
[0]: https://www.amazon.com/Dream-Machine-M-Mitchell-Waldrop/dp/1...