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arXiv · 2605.10357

RW-Post: Auditable Evidence-Grounded Multimodal Fact-Checking in the Wild

Danni Xu·Shaojing Fan·Harry Cheng·Mohan Kankanhalli
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Abstract

Multimodal misinformation increasingly leverages visual persuasion, where repurposed or manipulated images strengthen misleading text. We introduce \textbf{RW-Post}, a post-aligned \textbf{text--image benchmark} for real-world multimodal fact-checking with \emph{auditable} annotations: each instance links the original social-media post with reasoning traces and explicitly linked evidence items derived from human fact-check articles via an LLM-assisted extraction-and-auditing pipeline. RW-Post supports controlled evaluation across closed-book, evidence-bounded, and open-web regimes, enabling systematic diagnosis of visual grounding and evidence utilization. We provide \textbf{AgentFact} as a reference verification baseline and benchmark strong open-source LVLMs under unified protocols. Experiments show substantial headroom: current models struggle with faithful evidence grounding, while evidence-bounded evaluation improves both accuracy and faithfulness. Code and dataset will be released at https://github.com/xudanni0927/AgentFact.

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Danni Xu, Shaojing Fan, Harry Cheng, Mohan Kankanhalli. 2026-05-11. RW-Post: Auditable Evidence-Grounded Multimodal Fact-Checking in the Wild. https://arxiv.org/abs/2605.10357

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