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. Further, 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.

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