Social networking websites are causing alarming changes in the brains of young users, an eminent scientist 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... Computer games and fast-paced TV shows were also a factor, she said. 'We know how small babies need constant reassurance that they exist,' she told the Mail yesterday. 'My fear is that these technologies are infantilising the brain into the state of small children who are attracted by buzzing noises and bright lights, who have a small attention span and who live for the moment.'Quite.