Edward Stourton profiles Pete Cashmore, one of the world's most popular bloggers and tweeters, who founded the successful social media news website Mashable.He started it as a teenager in his bedroom in Scotland seven years ago and hired his first writer two years later. His company is now based in the US and employs 80 staff. His website attract millions of readers, and three million follow him on Twitter. The 27 year old has been described as "the Brad Pitt of the blogosphere".Cashmore is also one of the founders of the Social Good Summit, which takes place in New York this weekend to coincide with UN Week. The conference aims to connect people from all over the globe via social media. So will Pete Cashmore become a billionaire web entrepreneur and philanthropist? And what does he mean when he says he has been a "lifelong fan of unicorns"? Producers: Arlene Gregorius and Hannah Barnes.

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