On the eve of the encounter, the Royal United Services Institute published articles by the three leaders setting out their positions on defence.

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All manufacturers, exporters, and brokers of defense articles, related technical data and defense services are required to register with DDTC.

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Social-sharing widgets first appeared about five years ago, when online services such as Digg Inc. allowed users to share news articles.

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The aim is to maintain editorial quality while increasing efficiency, because titles can share writers and articles and pool resources for functions, such as subscription services.

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Mr Shayler is accused of disclosing state secrets in 1997 in a series of newspaper articles about alleged illegal activities and incompetence in the security services.

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And articles on subjects where advertising revenue is high, like financial services, tend to earn more money than those on, say, pottery.

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