The tool will collect data and start populating a shadow Twitter account with a daily tweet that the algorithm determines match the person's habits and interests.

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CoreLogic data shows the number of foreclosed homes and the size of the shadow inventory is massive.

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Fitch says the resulting growth of broad credit, which includes credit from shadow and offshore sources, was a factor in the recent improvement in Chinese data.

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Shadow health secretary Andy Burnham demanded a "categorical assurance" from the minister that data could not be used "for purposes other than research - passed on to third parties or used by the same company to target people for other products and services".

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Drilling into the data, Cheung highlighted the risks of over-leveraged local governments, unfunded pension plans and shadow banking.

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