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A Multimodal LLM-Based Nutrition Label for Analyzing Social Media Feed Exposure

Algorithmically curated social media feeds shape political exposure, commercial influence, and cultural consumption, yet they remain difficult to study systematically due to limited data access and opaque recommendation mechanisms. We present a research-oriented framework that operationalizes feed-level exposure analysis using a browser extension combined with a server-side multimodal large language model (LLM). The system logs visible posts and their view time, performs zero-shot multimodal classification, and aggregates results into a customizable nutrition label summarizing exposure across analytical categories. It further supports retrieval-grounded conversational querying, dataset export and sharing, and human validation of LLM classifications. Designed as a methodological instrument for Social Sciences and Humanities, the framework enables both observational analysis and experimental research on transparency interventions, while critically examining epistemic, methodological, and ethical implications of LLM-based exposure analysis.