User blog comment:Dragonlord247/what is the FIRST creepypasta..../@comment-14310129-20140711190036

Since the creepypasta genere is just an internet adaption of ghost stories you may never be able to find the very first "creepypasta." The first one probably started when a caveman saw some strange lights when hunting for food one night, and then told his buddies about it at dinner.

If you're looking for which modern horror story was first uploaded to the internet, then that's a slightly less trickey one. I would guess it would be one of the classic campfire stories that someone transcribed and posted to a BBS in the 80s or 90s. Would be interesting to find out which was the first, but pretty daunting to try and grab and review server dumps from a hojillion pieces of hardware since ARPANET was a thing.

And LOLSKELETONS already posted which one was first to be uploaded to the site.