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Page last updated at 12:37 GMT, Friday, 20 May 2011 13:37 UK

Tim Berners-Lee on the challenges facing the internet

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When Sir Tim Berners-Lee put the first website online nearly 20 years ago, he cannot have imagined how it has changed everything about our lives.

He explains why, in his view, the information we store online should remain open, accessible and free for people to use.

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