Danni Xu

Danni Xu

PhD Student | National University of Singapore

Multimodal AI · Trustworthy ML · Misinformation Detection

About

I am a PhD student in the School of Computing at the National University of Singapore, supervised by Prof. Mohan Kankanhalli. My research focuses on multimodal misinformation, explainable fact-checking, and trustworthy large multimodal models.

My current work studies how to build reliable benchmarks and evidence-grounded systems for detecting and explaining multimodal misinformation in real-world settings.

Prior to joining NUS, I received both my B.Sc. and M.Sc. degrees in Computer Science from Wuhan University, China.

Research Interests

Multimodal AI Misinformation Detection Fact-Checking Trustworthy AI Large Multimodal Models Explainability

News & Recent Activities

May 2026

Released the RW-Post dataset and codebase on GitHub: AgentFact.

May 2026

Our paper Modeling Human Responses to Multimodal AI Content was selected as a Cover Feature by IEEE Computer.

Apr 2026

RW-Post was accepted to the CVPR 2026 Workshop on Misinformation Detection in Society PP-MisDet.

2025

A New Dataset and Benchmark for Grounding Multimodal Misinformation was accepted to ACM Multimedia 2025.

2025

3MFact was accepted to AAAI 2025. Co-first author

2023

Combating Misinformation in the Era of Generative AI Models was accepted to ACM Multimedia 2023.

Selected Publications

Full list on Google Scholar →
RW-Post overview figure

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

Danni Xu, Shaojing Fan, Harry Cheng, Mohan Kankanhalli · CVPR 2026 Workshop, PP-MisDet

We present RW-Post, a real-world multimodal fact-checking benchmark that connects social media posts with auditable reasoning traces and evidence grounded in human fact-check articles. Using AgentFact, we evaluate modern LVLMs and show that faithful evidence grounding remains a major challenge.

T-Lens framework overview

Modeling Human Responses to Multimodal AI Content

Zhiqi Shen, Shaojing Fan, Danni Xu, Terence Sim, Mohan Kankanhalli · IEEE Computer, 2026 Cover Feature

Rather than focusing solely on detecting AI-generated content, this work studies how people perceive, trust, and interact with multimodal AI content. We introduce MhAIM, a large-scale dataset of human- and AI-generated media, and propose T-Lens, a human-centric framework for predicting user responses and providing interpretable explanations of trust, credibility, and influence.

Grounding multimodal misinformation figure

A New Dataset and Benchmark for Grounding Multimodal Misinformation

Bingjian Yang, Danni Xu, Kaipeng Niu, Wenxuan Liu, Zheng Wang, Mohan Kankanhalli · ACM Multimedia 2025

We present GroundLie360, the first real-world benchmark for grounding multimodal misinformation in videos. Beyond detection, this work localizes misinformation across text, speech, and visual modalities with evidence-based explanations, and introduces FakeMark as a VLM-based baseline.

3MFact overview figure

Pioneering Explainable Video Fact-Checking with a New Dataset and Multi-Role Multimodal Model Approach

Kaipeng Niu†, Danni Xu†, Bingjian Yang, Wenxuan Liu, Zheng Wang · AAAI 2025, Co-first author

We introduce a video fact-checking dataset with veracity labels, supporting evidence, and human-annotated rationales. We further propose 3MFact, a multi-role multimodal framework that retrieves and synthesizes online evidence to generate predictions, explanations, and supporting evidence.

AIGC misinformation overview

Combating Misinformation in the Era of Generative AI Models

Danni Xu, Shaojing Fan, Mohan Kankanhalli · ACM Multimedia 2023

We examine the challenges introduced by AI-generated misinformation and analyze manipulation traces across multiple levels, from signals and perception to semantics and human cognition. This work provides a conceptual foundation for explainable multimodal misinformation detection in the era of generative AI.

Professional Service

Contact

Feel free to reach out for research collaborations, academic discussions, or opportunities related to multimodal AI and trustworthy AI.

I am interested in postdoctoral and research scientist opportunities starting in late 2026 or 2027.