Screenshot from Web 2.0 Asia

According to the press release, it's the first chinese SNS adopting Japan's QR Code Technology! We think this is great news, as this will definitively help to push QR Codes in China as well. And that means we are getting ever closer to a global standard for 2D barcodes.
And why wouldn't they use Datamatrix? Datamatrix would work for ASCII URL's, but definitely not for the chinese script whereas QR Codes do - it's a japanese code after all.

More coverage of City!N:
City!N, an intelligent SNS? by Web 2.0 Asia
City!N, Intelligent SNS by 852signal