The author disagrees with Duncan Watts' view that word-of-mouth (WOM) plays a relatively minor role in diffusion. WOM is a personal and credible form of communication that can significantly impact the product lifecycle. There are two key differences between online consumer reviews and traditional WOM - the reach of online reviews is global via the internet, and an online seller can decide whether and when to provide reviews. Research shows supplying consumer reviews can benefit or hurt a seller depending on the product and review content. Consumers increasingly rely on reviews when making purchase decisions.