6 papers
Reddit's Globalization over Twenty Years: Inferring Community Time Zone from Activity Timestamps
Franco Della Negra, Mattia Samory, Matteo Cinelli
Online communities are a global phenomenon, but assessing their actual geographical spread requires accurate and scalable measurement. We propose and evaluate methods that infer th…
The Gray Area: Characterizing Moderator Disagreement on Reddit
Shayan Alipour, Shruti Phadke, Seyed Shahabeddin Mousavi +3
Volunteer moderators play a crucial role in sustaining online dialogue, but they often disagree about what should or should not be allowed. In this paper, we study the complexity o…
Asking For It: Question-Answering for Predicting Rule Infractions in Online Content Moderation
Mattia Samory, Diana Pamfile, Andrew To +1
Online communities rely on a mix of platform policies and community-authored rules to define acceptable behavior and maintain order. However, these rules vary widely across communi…
Generative Exaggeration in LLM Social Agents: Consistency, Bias, and Toxicity
Jacopo Nudo, Mario Edoardo Pandolfo, Edoardo Loru +3
We investigate how Large Language Models (LLMs) behave when simulating political discourse on social media. Leveraging 21 million interactions on X during the 2024 U.S. presidentia…
MARTSIA: A Tool for Confidential Data Exchange via Public Blockchain
Michele Kryston, Edoardo Marangone, Claudio Di Ciccio +6
Blockchain technology streamlines multi-party collaborations in decentralized settings, especially when trust is limited or difficult to establish. While public blockchains enhance…
Robustness and Confounders in the Demographic Alignment of LLMs with Human Perceptions of Offensiveness
Shayan Alipour, Indira Sen, Mattia Samory +1
Large language models (LLMs) are known to exhibit demographic biases, yet few studies systematically evaluate these biases across multiple datasets or account for confounding facto…