“…First, research on viral advertising has focused on the mechanisms that make viral advertising successful, adopting the point of view of advertisers and brands wishing to increase the effectiveness of their online campaign (Liu-Thompkins 2012). We implemented a tightly controlled experiment which deals with controversial taboo ads embedded in a press article and in a viral context (e.g., a Facebook page) with a control for external confounding variables that might otherwise have biased the results, such as the color, size, and position of the selected controversial taboo stimuli, the product category and brand name promoted in the selected stimuli, as well as potential covariates such as Facebook familiarity, intention to pass along the controversial ad, engagement with the press article, product category involvement, attitude toward the ad (Huhmann and Mott-Stenerson 2008), age, and sex (Katona et al 2011;Trusov et al 2010). By implementing a tightly controlled experiment, we investigate the 'unintended consequences' (Pollay 1986) of controversial viral advertising that undermine the degree of perceived tabooness of viral advertising and subjective norms.…”