K-Zero are a company that follow metrics in virtual worlds and last week they released their updated chart showing the number of registrations by platform over time.

Note that gaming worlds like World of Warcraft (with more than ten million active users) aren’t even part of the 300+ million, which just further illustrates the growing depth of the virtual world population. Of course, an even more interesting measurement would be how many of those people remain active.

Popularity: 7% [?]