189 © e Author(s) 2019 R. Boardman et al. (eds.), Social Commerce, https://doi.org/10.1007/978-3-030-03617-1_11 11 eWOM: The Rise of the Opinion Leaders Shuang Zhou, Helen McCormick, Marta Blazquez, and Liz Barnes Introduction e growth and evolution of new media such as Web 2.0 technologies has led to the development of new forms of communication channels and platforms, transforming marketing communications from traditional face-to-face word-of-mouth to electronic word-of-mouth (eWOM) (Cheung and adani 2012). Further, eWOM has attracted a great deal of attention among marketers and researchers (Trusov et al. 2009). Because of consumers increasingly engaging in eWOM communication to exchange information about goods, services, brands, or companies, eWOM becomes one of the most significant communication touch points to engage consumers in their pre- and post-purchase experience (King et al. 2014). It has been documented that eWOM has significant effects on consumer purchase decision-making process (Daugherty and Hoffman 2014; Mishra and Satish 2016; King et al. 2014; Batra and Keller 2016; S. Zhou • H. McCormick (*) • M. Blazquez • L. Barnes School of Materials, University of Manchester, Manchester, UK e-mail: shuang.zhou@manchester.ac.uk; helen.mccormick@manchester.ac.uk; marta.blazquezcano@manchester.ac.uk; liz.barnes@manchester.ac.uk