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Facebook鈥檚 鈥渓ike鈥� button is ubiquitous across the web. Seeing what people 鈥渓ike鈥� helps Facebook understand its users 鈥� which means they can target adverts more effectively, and tailor newsfeeds so people spend more time on Facebook. Some say there鈥檚 nothing to worry about 鈥� targeted adverts are nothing new. Others worry that the Cambridge Analytica scandal shows how Facebook might shape our opinions. But perhaps what we should worry about most is that social approval can be addictive, and a 鈥渓ike鈥� is social approval distilled into its purest form. Tim Harford asks how should we manage our compulsions in this brave new social media world?

Producer: Ben Crighton
Editor: Richard Vadon