Several studies, in the past few years, have demonstrated that eWOM review credibility is a basic requirement for the adoption of the eWOM message (Lis, 2013). Indeed, according to the author, the more the recipient perceives the message as credible, the greater is the chance that the message information will be adopted and used. This is the reason why it is crucial, in order to understand the effects of eWOM reviews on the purchase decision process, to gain a better understanding of all of the determinants which lead the review to be perceived as credible by the reader.