It's hard to imagine we ever lived in a world without internet, yet it's only been knocking around for twenty-five years now. It's been expanding at an accelerating pace though, with everything from telephones, music, film, and television being redefined by it. In a very appropriate scheduling by the BBC considering all that's gone on these last few days, this Horizon documentary looks at the concerns that have come from this vast expansion including the issues of surveillance. The programme meets hackers and scientists who are using technology to fight back, as well as the law enforcement officers who believe it's leading to opportunities for risk-free crimes. We'll also meet the World Wide Web inventor Tim Berners-Lee and WikiLeaks co-founder Julian Assange.