Abstract Influencer marketing has become big business. But while influencers have the potential to spread marketing messages and drive purchase, some posts get lots of engagement and boost sales, while others do not. What makes some posts more impactful? This work examines how sensory language (e.g., words like “crumble” and “juicy” that engage the senses) shapes consumer responses to influencer-sponsored content. A multimethod investigation, combining controlled experiments with automated text, image, and video analysis of thousands of sponsored social media posts, demonstrates that sensory language increases engagement and willingness to buy the sponsored product. Furthermore, the studies illustrate that these effects are driven by perceived authenticity. Sensory language leads consumers to infer that influencers actually use the product they are endorsing, which increases perceived authenticity, and thus engagement and purchase. These findings shed light on how language shapes responses to influencer-sponsored content, deepen understanding of the drivers of authenticity, and suggest how to develop more impactful social media campaigns.

Electrophysiological and hemodynamic studies provide substantial evidence of dissimilar brain responses when people view emotional compared with neutral pictures. This study investigates consumer brain responses underpinning passive viewing of luxury (high emotional value) versus basic (low emotional value) branded products when participants are alone or with another person. Conforming to social facilitation theory and using electroencephalogram methods, the authors recorded event-related potentials while female participants passively viewed pictures of luxury and basic branded products. They examined event-related-potential amplitudes in three time windows, corresponding to the P2 and P3 components and the late positive potential (LPP). Dissimilar brain responses occurred in the Together but not the Alone condition for the P2 and P3 components over visual cortex sites. The LPP amplitude was higher for luxury than for basic branded products, but only in the Together condition, suggesting that the presence of another person magnifies the emotional effect of brand type. Taken together, the results suggest that LPP amplitude during passive viewing of relevant marketing images reflects increased attention allocation and motivational significance, both enhanced by the presence of another person, to stimuli with higher emotional value.

Influencer marketing is a popular strategy to connect with consumers. However, influencers’ use of overly high-arousal language in promoting products (e.g., “it's totally AMAZING!”) has raised questions about their true motivations. This article investigates how high-arousal language in micro- versus macro-influencers’ sponsored posts might shape engagement. A multimethod approach, combining automated text, image, video, and audio analyses of thousands of Instagram and TikTok posts with controlled experiments, demonstrates that high-arousal language increases engagement with micro-influencers, but it decreases engagement with macro-influencers, seemingly because it makes micro- (macro-) influencers appear more (less) trustworthy. Yet the negative effect of arousal for macro-influencers can be mitigated if their posts provide counterbalanced valence (both positive and negative assessments) or if they indicate an informative, rather than commercial, goal. These findings deepen understanding of how language arousal shapes consumer responses, reveal a psychological mechanism through which language arousal affects perceptions, and provide actionable insights for crafting more effective social media content.