During my research for a paper on the online documenting of viral marketing campaigns for film and television, I came across a site called Cloudmakers.org. The site was founded in April 2001 as "as a discussion group for the intera[c]tive web game centered around the film A.I."
A.I. (or Artificial Intelligence) was a movie released in 2001 produced and directed by Steven Spielberg, and originally a collaboration between Spielberg and Stanley Kubrick until Kubrick passed away in pre-production. To accompany its release Jordan Wiesman (at the time at Microsoft, now at 42 Entertainment) and his team (including lead designers Elan Lee and Sean Stewart) created an intricate online puzzle that tapped into the story of the film and, over a 2-3 month period, drew 3 million players into the game making them "active participants in the fiction before the film’s release". Appearing in the credits on posters and in the trailer was the fictional credit "Jeanine Salla — Sentient Machine Therapist". That tiny clue lead players into a murder-mystery story that was tied into the narrative of the film and ultimately included a plethora of webpages, email addresses and live events.
Cloudmakers was an online forum for players of the game to share information, collaborate in puzzle solving, and, since the game finished, be an archive of the game and the process of solving the puzzle.