As I already wrote in my thesis last year qq.com will increase importance in the asia web scene.
Not only No1 in social networks with 300m users but also one of the strongest e-money currencies. The so called QQ coin (by tencent) is forbidden by the chinese government but due to its “digitality” it is impossible for the government to control the circulation. QQ is not only a social network but also a famous instant messenger in asia.
After the discussion going around with second life and legal regulations of the virtual economy there could also start a new discussion soon when other social networks start own currencies inside there networks. Or more likely OpenSocial starts with a own micro-currency for the trade of informations and widgets between social networks.
The sun is shining but if you are able to read german you could read more about virtual currencies here..
http://de.geocities.com/michaelaltendorf80/Diplomarbeit_MA.pdf
The topic came up because of this blog entry on asian social networks.
Update: you also could get a bad formatted version here http://michaelaltendorf.wordpress.com/2007/10/16/internet-taxation-and-virtual-worlds/