SCP is a fascinating, addictive storytelling project. It purports to be documents around the activities of the Secure, Contain, and Protect Foundation. The group tracks down mysterious and dangerous... artifacts, then tries to S, C, and P them.
Each entry is a single wiki page, sometimes with supplemental materials, such as images, logs, or further evidence. Entries classify objects based on their threat level to humanity, how (if) they are currently archived, and what the Foundation currently knows about them.
These short stories range in tone from horrific to whimsical. They use a made-up jargon to add a bureaucratic layer to events, which makes SFP seem both more real and disturbing. Characters and other organizations appear, including scientists, "volunteers", and competitors, which humanize the Foundation's progress. Imagine a mix of X-Files, Lovecraft, Charlie Stross, and Kafka.
We are the last bastion of security in a world where natural laws rapidly break down. We are here to protect humanity from the things that go bump in the night, from people who wield power beyond mortal understanding. We are here to make the world a safer place. We are the holders of wonders, and the crafters of dreams. We are why the world continues. In the short form, we're a creative writing site, devoted towards horror.
It's a terrific example of wiki storytelling. Multiple users can create entries. Discussion tabs show workshopping and feedback.
Warning: very, very addictive.
701, or The Hanged King's Tragedy: a 17th-century play's text is haunted, perhaps carrying a lethal memetic virus.
1845: a fox who seems to be possessed by a European ruler.
093: a disk which allows people to enter mirrors and the dire world they access.
1440: a sad, ancient, uncontrollably destructive card player.
914: a machine that... processes things. Staff misuse it.
1981, or Reagan Cut Up While Talking: a lost VHS tape of a Ronal Reagan speech. Each time it's played the president's speech alters in grim ways, and his body is tortured.
895: an ancient, demonic being kept in storage. Mostly.