The first online chat system was called Talkomatic, created by Doug Brown and David R.Woolley in 1973 on the PLATO System at the University of Illinois.
The first online system to use the actual command "chat" was created for The Source in 1979 by Tom Walker and Fritz Thane of Dialcom, Inc.
As an example, it is considered rude to write only in upper case, because it appears as if the user is shouting.
The word "chatiquette" has been used in connection with various chat systems (e.g. Writing is changing as it takes on some of the functions and features of speech.
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Online chat may refer to any kind of communication over the Internet that offers a real-time transmission of text messages from sender to receiver.