Dark Metal has been a MUSH (a 'Multi-User Shared Hallucination') since-- somewhere around the early 1990s? Any of the dinos should correct me.
A MUSH is a heavily customized series of interlinked chatrooms in which players create characters, move from room to room in an interactive world, and participate in text-based roleplay. There are tools to help track stats, calculate and roll dice, vehicles to drive (and fly) around, and more elaborate toys. (You can build your own!)
This particular MUSH is based on the White Wolf Old World of Darkness theme (revised edition, don't ask which one, we're sort of fuzzy on that ourselves), set in a futuristic, cyberpunk, post-apocalyptic version of Los Angeles and the surrounding territories. We support many of the OWoD systems, including Vampire, Werewolf (Garou, Bastet, Corax, Ratkin), Mage, Mortal+ (Sorcerers/Psychics and Cyber), and garden-variety humans.