It's their home, even if the neighborhoods of prefabricated high-rise tenements seem bleak, the list of free-time activities is limited, and several of their friends have already had problems with the skinhead groups that are gaining in popularity.

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YY, which boasts more than 400 million registered users who engage in real-time group activities like karaoke and tutoring through audio, text and video on the free platform, went public in the U.S. rather than in Hong Kong or Singapore because its platform has "global implications, " Chief Executive David Xueling Li said in New York, through a translator.

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