Online networking 'harms health'

People's health could be harmed by social networking sites because they reduce levels of face-to-face contact, an expert claims.
Dr Aric Sigman says websites such as Facebook set out to enrich social lives, but end up keeping people apart.
Dr Sigman makes his warning in Biologist, the journal of the Institute of Biology.
A lack of "real" social networking, involving personal interaction, may have biological effects,

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In less than two decades, the number of people saying there is no-one with whom they discuss important matters nearly tripled.

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