Facebook and Twitter have created a generation obsessed¹ with themselves, who have short attention spans and a childlike desire for constant feedback on their lives, a top scientist believes.

一位顶尖科学家认为，Facebook和Twitter令新一代人变得自恋、注意力短暂，而且像小朋友那样，渴望得到别人对他们生活的持续回应。

Repeated exposure to social networking sites leaves users with an 'identity crisis', wanting attention in the manner of a toddler（学步的小孩） saying: 'Look at me, Mummy, I've done this.'

Baroness² Greenfield, professor of pharmacology at Oxford³ University, believes the growth of internet 'friendships' – as well as greater use of computer games – could effectively 'rewire' the brain.

This can result in reduced concentration, a need for instant gratification（满意，喜悦） and poor non-verbal skills, such as the ability to make eye contact during conversations.

More than 750million people across the world use Facebook to share photographs and videos and post regular updates of their movements and thoughts. Millions have also signed up to Twitter, the 'micro-blogging' service that lets members circulate short text and picture messages about themselves.

Baroness Greenfield, former director of research body the Royal Institution, said: 'What concerns me is the banality⁴（平凡，陈腐） of so much that goes out on Twitter.

'Why should someone be interested in what someone else has had for breakfast? It reminds me of a small child (saying): “Look at me Mummy, I'm doing this”, “Look at me Mummy I'm doing that”.

'It's almost as if they're in some kind of identity crisis. In a sense it's keeping the brain in a sort of time warp⁵.'

The academic suggested that some Facebook users feel the need to become 'mini celebrities⁶' who are watched and admired by others on a daily basis. They do things that are 'Facebook worthy⁷' because the only way they can define themselves is by 'people knowing about them'.

'It's almost as if people are living in a world that's not a real world, but a world where what counts is what people think of you or (if they) can click on you,' she said.

'Think of the implications for society if people worry more about what other people think about them than what they think about themselves.'