The widespread use of smart devices and advances in network technology have significantly transformed social networking services (SNS). Today, SNS platforms serve as the pivotal channels for communication, marketing, and commerce. Major platforms, including YouTube, Instagram, and TikTok, have introduced integrated shopping features, fostering comprehensive e-commerce ecosystems. Despite these improvements, SNS platforms still face notable challenges, particularly in capturing detailed consumer behavior data and managing complicated product registration processes. To overcome these limitations, multilink (“link-in-bio”) services have emerged as valuable tools, especially for influencers engaged in social media-driven commerce. This study investigates how the use of a specific link-in-bio service, “Kemi,” provided by Wired Company, influences sales, particularly in group-buying scenarios. Analyzing daily data from June 2023 to April 2024, we employed linear regression analysis to explore how different user behaviors―card clicks, views of product detail pages, and video content plays―affect daily sales. Our findings show that user activities such as clicking cards and viewing product details positively influence sales performance. These behaviors clearly indicate effective user engagement and enhanced purchase decisions. However, frequent viewing of video content had a negative effect on sales, likely due to users experiencing information overload and fatigue from repeated content exposure. Therefore, the results highlight the necessity of strategically managing content in link-in-bio services. Optimizing content delivery to avoid redundancy is essential for improving user experiences and maximizing commercial outcomes.