Data from the New York-based consultancy CPM Group also shows gold-mining output rising, with some 66 million ounces in 2009, followed by 68 million in 2010.

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Simultaneously, third-party vendors are rapidly increasing cost-per-fan, CPM, and so forth.

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Catherine Virga, director of CPM Group, said the consultancy had estimated an end-of-2010 Chinese inventory of at least 1.63 million tons.

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At the same time, the shift from PC-based display ads to mobile audio ads is driving down the blended CPM.

FORBES: Connect