South Korean mega-social network Cyworld has launched in the US, bringing another avatar-based social system to the already crowded US market. Cyworld is a giant in South Korea, with reportedly 90% of the population under the age of 20 registered to the service, which is a market share I doubt they’ll ever see here in the US. Cyworld ties in a web-game with social networking, allowing the user to create their own personalized cartoon avatar and Minihome to personalize and invite friends to visit. There is even an in-world currency (not currently present in the US version) where users can purchase more Cyworld Currency (Acorns?) in exchange for real-world currency (not sure if that works vice-versa). I unfortunately don’t see this service taking off stateside, as their reliance on the younger market just doesn’t translate over to the US and with services like MySpace and Facebook currently struggling to define themselves in the youth market, it makes it that much rougher for Cyworld.

Read more: Cyworld (Via Techcrunch)