Influencer marketing has drastically changed how consumers and brands interact. As its popularity grows, influencer marketing has gone beyond just being a commercial tool to support marketing communication strategies. It has started to impact many other areas, such as culture, politics, social identity, and health. In recent years, there has been a noticeable increase in academic interest, and influencer marketing has become one of the most discussed topics in marketing literature. Nevertheless, most current literature focuses on commercial practices, brand relationships, and consumer behavior. Although studies examining the adverse psychological effects and associated risks of influencer culture have begun to increase in recent years, research in this area is still limited in understanding societal-level effects. This chapter addresses that gap by discussing the positive and negative social dimensions of influencer marketing and examining its broader impact on society from a macro-level perspective. This study analyzes the social effects of influencer marketing under the headings of health and well-being, sustainability, social identity, politics, and economic participation. Under each heading, both the potential for social benefits (e.g., increased public awareness, the formation of participatory communities, the promotion of inclusive values) and possible adverse outcomes (e.g., misinformation, polarization, the reinforcement of harmful norms) are discussed from a critical perspective. This dual assessment allows us to understand the multi-layered role of influencer culture in social life. Following the analysis of positive and negative impacts at the social level, the study moves to a broader macro-societal level. It conducts a comprehensive discussion on how these impacts trigger transformations in institutional trust, authority structures, and public discourse at the macro level.