Amazon is cracking down on biased customer reviews

Amazon updated its community guidelines today to prohibit so-called "incentivized reviews," which are customer reviews of a product that was received for free or at a discount in exchange for an online write-up. The company says these types of reviews make up a tiny fraction of overall Amazon.com reviews. Yet studies have shown that incentivized reviewers are less likely to give products negative feedback and review hundreds of products on average, potentially affecting the overall sales perform