With over 3 billion active social media users and a global penetration rate of 50.3% (Statista, 2021), social media platforms have become one of the defining technologies of our time (Appel et al., 2020). Originally created as marketing communication tools, the emergence of social media platforms has had broad positive effects on consumers and society. They influence the way we interact and relate to others, build our identity and reputation, create, consume and share content, and perceive the world around us. Kaplan and Haenlein (2012) described the emergence of social media as "re-transform [ing] the internet to what it was initially created fora platform to facilitate information exchange between its users." Consequently, the social media phenomenon has attracted significant interest from both practitioners and academics, all striving to develop a deeper understanding of the various ways social media affects individuals, organizations and society.Most early research documented the benefits of social media use. Social media platforms allow people to significantly expand the geographical range of their active social connections and maintain these connections for a much longer time (Mukherjee, 2018). They also enable authentic self-expression, associated with greater subjective well-being (Bailey et al., 2020) and mobilize people around social or political objectives, prompting authoritarian regimes to try and restrict the operation of social media (Zhuravskaya et al., 2020). The emergence of social media platforms has also created opportunities for consumers to engage in open dialogue with brands and organizations, allowing marketers to use online communities and their conversations as part of the process of value co-creation (Fuduric, 2016).More recently, there has been a surge in research exploring the dark side of social media. Several authors have commented on the potential or actual detrimental ways in which these platforms affect private, professional, and social life (Boroon et al., 2021;Fox and Moreland, 2015). This theme is the focus of the special issue on "The Dark Side of Social Media," the first result of the collaboration between the European Journal of Marketing and the European Marketing Academy (EMAC). EMAC is a flourishing academic community with over 1,000 members across all subdivisions of marketing. Social media in marketing is an important research stream among EMAC members, with a special interest group and a dedicated competitive paper track on digital and social media marketing at the EMAC annual conference. Several papers in this special issue have been co-authored by participants in recent EMAC conferences and special interest group activities. Most authors work in Europe, but the issue features contributions from all over the globe, including North and South America, India, Japan and Australia.Research into the dark side of social media use is still in its infancy, and much of the prior work has been descriptive, answering "what" questions rather than "how" or "why" questions, which...