Peter Carragher

PhD Student
CASOS and IDeaS Center
Carnegie Mellon University

I’m a PhD student at the Center for Computational Analysis of Social and Organizational Systems (CASOS) and Center for Informed Democracy & Social - cybersecurity (IDeaS) at Carnegie Mellon University, advised by Dr. Kathleen M. Carley and Dr. Patrick Park.

My research primarily focuses on developing search-based interventions, assessing source credibility in online news media, and modeling social influence processes in social media. Utilizing an interdisciplinary approach, I integrate techniques from network science and machine learning with theories from social and information sciences. I use these methods to study information diffusion and retrieval systems, with the aim of enhancing the reliability of the online information ecosystem.

In the past I was lucky to be supervised by Dr. Ashok Goel in the Design Intelligence Laboratory (DILab) at Georgia Insitute of Technology, researching the roles of intellgient agents in educational environments. Prior to this, I developed machine learning detection and response systems at Meta, where my work has been deployed in areas of fraud and deception such as impersonation, coordinated inauthentic behavior, and election integrity.

Publications

SegSub: Evaluating Robustness to Knowledge Conflicts and Hallucinations in Vision-Language Models

Peter Carragher, Nikitha Rao, Abhinand Jha, R Raghav, Kathleen M. Carley
MisD: ICWSM Workshop on Misinformation Detection in the Era of LLMs. 2025.
workshop paper pdf . code . data

Bridging Social Media and Search Engines: Dredge Words and the Detection of Unreliable Domains

Evan M. Williams, Peter Carragher, Kathleen M. Carley
Upcoming at ICWSM 2025: The 19th International AAAI Conference on Web and Social Media. 2025.
conference paper pdf . code

Quantifying Memorization and Parametric Response Rates in Retrieval-Augmented Vision-Language Models

Peter Carragher, Abhinand Jha, R Raghav, Kathleen M. Carley
Upcoming at L2M2: ACL Workshop on Large Language Model Memorization. 2025.
workshop paper pdf

Mapping the Scientific Literature on Misinformation Interventions: A Bibliometric Review

Catherine King, Peter Carragher, Kathleen M. Carley
COMPASS: The 1st international Workshop on Computational Approaches to Content Moderation and Platform Governance. 2025.
workshop paper pdf . data

Misinformation Resilient Search Rankings with Webgraph-based Interventions

Peter Carragher, Evan M. Williams, Kathleen M. Carley
ACM Transactions on Intelligent Systems and Technology: Special Issue on Responsible Recommender Systems. 2025.
journal article pdf . code . data . slides

Detection and Discovery of Misinformation Sources using Attributed Webgraphs

Peter Carragher, Evan M. Williams, Kathleen M. Carley
ICWSM 2024: The 18th International AAAI Conference on Web and Social Media. 2024.
conference paper pdf . code . data . slides

Accountability in Search Engine Manipulation: A Case Study of the Iranian News Ecosystem

Peter Carragher, Kathleen M. Carley
SBP-BRiMS 2024: International Conference on Social Computing, Behavioral-Cultural Modeling and Prediction and Behavior Representation in Modeling and Simulation. 2024.
conference paper pdf . code . data . slides

Simulation of Stance Perturbation

Peter Carragher, Lynnette Xian Ng, Kathleen M. Carley
SBP-BRiMS 2023: International Conference on Social Computing, Behavioral-Cultural Modeling and Prediction and Behavior Representation in Modeling and Simulation. 2023.
conference paper pdf . code . slides

Simulation of Stance Perturbation

Peter Carragher, Lynnette Xian Ng, Kathleen M. Carley
WSC 2022: Proceedings of the 2022 Winter Simulation Conference. 2022.
abstract

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