I'm using "internet horror" as an umbrella term for any horror fiction that presents itself as, or is about, something "found on the internet." This can be anything from a story formatted as a blog post about something terrifying that happened to the author, to cursed image stories like Smile Dog.
I'll start:
Ted the Caver: Originally posted as an Angelfire site that has since unfortunately been taken down. Chronicles the journey of a caver who gradually discovers that the cave he's exploring has something living in it.
The Story of TRAINING.bsp: A blog reminiscing about the author's days exploring strange custom Half-Life maps with his clan. One of these maps takes a sinister turn.
The Dionaea House: A series of emails and text messages about a strange house. Or rather, a strange thing pretending to be a house.
Local 58 has always been one of my favourites for the atmosphere it creates without showing anything actually scary.
SCP also has great horror stories but it can be hard to find them among the more scifi or weird fiction style entries. 3999 is great for being really creative (CW violence, sa). And there's a few others that play audio or something that freak me out.
SCP-1984, the one about the Reagan tape, is the one that creeps me the fuck out. Haunted technology like video tapes and TV broadcasts really get under my skin, for some reason. I can't watch Local 58 because I'll be uncomfortably scared lol
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