| http://www.w3.org/ns/prov#value | - t has warned.Sites such as Facebook, Twitter and Bebo are said to shorten attention spans, encourage instant gratification and make young people more self-centred.The claims from neuroscientist Susan Greenfield will make disturbing reading for the millions whose social lives depend on logging on to their favourite websites each day.. . .Baroness Greenfield, an Oxford University neuroscientist and
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