Gary Hayes, Director of the Laboratory for Advanced Media Production in Sydney, has produced a short video that covers 50 virtual worlds that do not include gaming worlds.
This is worth watching as it shows the way Virtual Worlds are evolving that already are attracting 300 million people worldwide.
Just remember these Virtual Worlds cannot be accessed by search-engines and are the foundation to Web 4.0 Artificial Intelligence Complementing Humans.
Please go to link http://virtualworlds.nmc.org/2008/08/06/50-virtual-worlds/