1973 Invention Talkomatic is created by Dave Woolley and Douglas Brown at the University of Illinois, as a multi-user chat room application. It is an instant sensation among users in the PLATO System's online community (16h 46min, jan 1, 1975 y – 12h 52min, mar 28, 1975 y)
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16h 46min, jan 1, 1975 y
12h 52min, mar 28, 1975 y
~ 2 months and 26 days