tl/dr: The original smiley was proposed by Scott Fahlman at at Carnegie Mellon on Sept 19, 1982:
19-Sep-82 11:44 Scott E Fahlman :-)
From: Scott E Fahlman <Fahlman at Cmu-20c>
I propose that the following character sequence for joke markers:
:-)
Read it sideways. Actually, it is probably more economical to mark
things that are NOT jokes, given current trends. For this, use
:-(
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"I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones." - Linus Torvalds, father of Linux on his hobby that ended up changing the world of technology