Really?! I'm actually kinda surprised, I would have guessed it's a much more recent abbreviation than that. I think I only started seeing it around 2010 or so.
"tl;dr" was around when I hung out on LiveJournal, so definitely pre-2010. This would have been around '01-'06.
Re:Amazon.com Homepage (1999)
by shitloadofbooks on Monday January 24, 2022 @07:59PM
(#30066472)
Anecdotally I remember first encountering it on the Something Awful forums. I always assumed it originated there (like lots of stuff did in the early 2000s).
https://www.howtogeek.com/435266/what-does-tldr-mean-and-how... claims early 2000s