Dr. Signe Rousseau is a lecturer at the University of Cape Town. She is the author of Food Media: Celebrity Chefs and the Politics of Everyday Interference and Food and Social Media: You Are What You Tweet. She is also co-chair of Gastronomica: The Journal for Food Studies (University of California Press).

'An idea worth at least 40 nanoKardashians of your attention', My Heart's in Accra

'Celebrity Magazines Post a Downturn in Sales', The New York Times

'Ethics of Celebrities and Their Increasing Influence in 21st Century Society', Journal of Business Ethics

'Celebrity: How Entertainers Took Over the World and Why We Need an Exit Strategy', Marina Hyde

'Is Jamie's Dream School a success?', The Guardian

'Ashton Kutcher's Popchips Ad Pulled After Racism Outcry', ABC

'Popchips', Forbes

'Paula Deen Dumped By Home Depot and Diabetes Drug Novo Nordisk As Target, Sears, QVC Mull Next Move', Forbes

'Blackberry Spokeswoman Alica Keys Blames iPhone Tweet on Drake-Obsessed Hacker', Slate

'BlackBerry Job Cuts: Smartphone Maker To Lay Off 4,500', The Huffington Post

'Jamie Oliver: I cause a storm every time I open my mouth', The Observer

'OFM awards 2013 chef of the decade: Heston Blumenthal', The Observer

'Celebrity-Obsessed Culture Has Overtaken Marketing', Ad Age

'Beats by Dre: Best Headphones or Best Marketing', Viewpoints

'When Exclusivity is Crucial for Celebrity Endorsements', strategy + business

'When Good Celebrity Endorsers Go Bad, Markets Get Angry (But Not for Long)', strategy + business

Authority is slipping away from 'traditional' experts – and into the hands of celebrities. But is 'standing out' from a sea of information, products and ideas as simple as putting a famous face on a brand?

The rise of the celebrity 'expert'