Honestly, things like that remind me how vast the internet is. There are some things that I think are just ubiquitous that my friend has never heard of before. She had never heard of Creepy Pastas. She had never seen Long Long Man. She didn't know what an SCP was. I was baffled. Made me think about my own digital world, and what sources I may be completely blind to.
SCP Foundation is a fictional (I hope) organisation with the mission to Secure, Contain, Protect various anomalies catalogued with numbers (SCP-#) which are thus also referred to as SCPs. These anomaly descriptions are available on https://scp-wiki.wikidot.com/
Some of the anomalies are references to other fictional things. If you're familiar with Slenderman, for instance, you may enjoy SCP-096.