Why do companies demand our feedback and reviews, for everything from a flight to a $5 Amazon purchase? Ed Butler asks Mike Petrook, director of corporate affairs at the UK's Institute of Customer Service, while writer, journalist and sociologist Anne Karpf laments the rise of the feedback questionnaire. We also hear from Eric Rea, founder of Podium, a US startup that provides reviewing technology to companies that were previously offline - a fast-growing market. (Photo: Feedback buttons, Credit: Getty Images)