MMO worlds

Modern MMO's history can be traced to MUD in early days, while the concept is very similar. The major difference should be whether the graphics is generated by brain or by NVIDIA. People build and run their lives in another virtual world, similar to the concept of The Matrix. This should be the reason why many people spend their time in, not only the beautiful virtual reality, but a dream world that cannot be obtained in reality. They're not just games. Statistics can be viewed from the following reference.

REF: http://mudstats.com/