* Cyworld, Korea: $200m in 2008 revenues, 22m registered users, valuation unknown.
* Mobile Game Town, Japan: $250m in 2008 revenues, 12.6m registered users, valuation $1.4 billion.
* Gree, Japan: $60m in 2008 revenues, 8m registered users, valuation $1.2 billion.
The full article was originally published at VirtualGoodsNews, but is no longer available.
Mark Brooks: How is your dating site using virtual currency? How do you think you could make more money by using virtual currencies?