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WORLD'S LARGEST INTERACTIVE VIDEO ART

Gareth goes behind the scenes of Under Scan, a huge interactive art installation in Trafalgar Square, London. Every night this week until 23 November, Mexican-Canadian artist Rafael Lozano-Hemmer, is turning visitors' shadows into the canvas for his art installation. He uses theatre lighting, surveillance technology and 1,000 moving video portraits to create a truly interactive experience.

IS THE INTERNET KILLING CULTURE?

Internet critic Andrew Keen this month launches the new edition of his book The Cult of the Amateur – how today's internet is killing our culture. In it, Keen claims that "MySpace and Facebook are creating a youth culture of digital narcissism; the cacophony of anonymous blogs is deafening today’s youth to the voices of informed experts and professional journalists."

Solana Larsen disagrees. She is managing editor of Global Voices Online, which publishes the best blogs from around the world. They join Gareth for a discussion about the affect blogs and social networks are having on global culture.

BRAZIL'S CINEMA ON DEMAND

Can't find a film you want to watch at your local cinema? A new web service in Brazil called MovieMobz lets cinema-goers select which film they want to see and where. Digital Planet's Michelle Martin visits an all-night screening in São Paulo, and chats to the creator of MovieMobz, Fabio Lima.