From www.platopeople.com:
"Before Microsoft. Apple. The Web. AOL. The Internet. Before everything, there was PLATO: the first online community. The network that time forgot. The birthplace of instant messaging, chat rooms, MUDs (multi-user dungeons), personal publishing, screen savers, flat-panel plasma displays, one of the first spell-checking/answer-judging mechanisms, and countless other innovations. This site offers information regarding a book being researched and written about the PLATO system and the user culture that it spawned in the 1970s. For more details, click the image above, or any of the links at the top."
Brian Dear is writing a book and website. In June there will be a conference.