We all know that reviews sell stuff. After all, when’s the last time you took a chance on buying something online, sight unseen, without checking the reviews? You want to know what other people who’ve already bought it think so that you can be sure you’re making the right choice. That’s called social proof—when seeing that other people like something encourages you to try it yourself. And social proof isn’t just useful when buying a phone or a new pair of shoes. It sells books, too! But reviews can feel like a chicken-and-egg situation sometimes. You need reviews to sell