... thesis contains three separate essays dealing with electronic word- of- mouth The first essay uses word- of- mouth in the form of user comments for generating recommendations of high-scale products Here, ... to deep understanding of eWOM in emerging domains, but more importantly, provides practical implications for efficient policy making in product recommendation, advertisement, and information diffusion ... (Okada and Yamamoto, 2011; Chatterjee, 2001) have investigated the in uence of electronic word- of- mouth on customers’ purchase intention and also explored the varying effects of positive and negative...