The World Wide Web is a little over 30 years old. During those years, so much has happened in various parts of the Internet that Internet History could be a separate subject in schools. Perhaps the things that get the most attention in the lore of the Internet are creepy, mysterious stories.
You may have participated in this digital folklore yourself: The Backrooms, Slenderman, or some other creepypasta you read at 2 AM are all Internet urban legends. The folks at r/InternetMysteries explore the dark side of the Internet and try to track down the roots of some of these creepy stories. Check out some of the stories that they managed to solve; some may have completely normal explanations, while others deserve to go straight to creepy jail.
More info: Reddit
