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Jonathan Franzen aghast at destructive social media

The US novelist Jonathan Franzen exploded into public consciousness with his book The Corrections.

He also achieved critical acclaim with Freedom - both books focus on the anxieties and preoccupations of modern America.

Franzen is also an essayist and social commentator who famously disparaged the internet and was thus described as a luddite.

He spoke to Newsnight's Kirsty Wark about his new novel Purity.