CHAPTER EIGHT THE PETRIFIED FOREST One of the most powerful persuasion techniques is social proof. Advertisers and marketers know the power of social proof, which is why they use it so often in their marketing materials. Social proof demonstrates to potential customers that a product is popular, causing the customers to think that the product is good to buy. 21 – THE SITCOM LAUGHTER TRACK Television studios realize the power of social proof, which is why a lot of TV sitcoms contain canned laughter. Research has found that people who view sitcoms that have laughter tracks find the sitcoms to be funnier than sitcoms that don’t. It can happen because the canned laughter serves as social proof, and when we hear people laughing, it causes us to laugh too. In another example of the power of social proof, researchers who joined a door-to-door charity campaign found that the longer the list of prior donors, the more likely it was that the person being solicited would donate as well....