Research
Publications
Selected journal articles, conference papers, and related work.
2026
Learning from Convenience Samples: A Case Study on Fine-Tuning LLMs for Survey Non-response in the German Longitudinal Election Study
Tobias Holtdirk, Dennis Assenmacher, Arnim Bleier, Claudia Wagner
Proceedings of the Conference on Natural Language Processing (KONVENS 2026), Association for Computational Linguistics
Beyond the Explicit: A Bilingual Dataset for Dehumanization Detection in Social Media
Dennis Assenmacher, Paloma Piot, Katarina Laken, David Jurgens, Claudia Wagner
Findings of the Association for Computational Linguistics: EMNLP 2026, Association for Computational Linguistics
2025
Personas with Attitudes: Controlling LLMs for Diverse Data Annotation
Leon Frohling, Gianluca Demartini, Dennis Assenmacher
Proceedings of the The 9th Workshop on Online Abuse and Harms (WOAH), Association for Computational Linguistics, pp. 468--481
Addressing Systematic Non-response Bias with Supervised Fine-Tuning of Large Language Models: A Case Study on German Voting Behaviour
Tobias Holtdirk, Dennis Assenmacher, Arnim Bleier, Claudia Wagner
OSF Preprints
Enhancing Training Data Quality through Influence Scores for Generalizable Classification: A Case Study on Sexism Detection
Rabiraj Bandyopadhyay, Dennis Assenmacher, Jose M. Alonso-Moral, Claudia Wagner
Proceedings of the 14th International Joint Conference on Natural Language Processing and the 4th Conference of the Asia-Pacific Chapter of the Association for Computational Linguistics, The Asian Federation of Natural Language Processing and The Association for Computational Linguistics, pp. 1382--1403
Addressing Systematic Non-response Bias with Supervised Fine-Tuning of Large Language Models: A Case Study on German Voting Behaviour
Tobias Holtdirk, Dennis Assenmacher, Arnim Bleier, Claudia Wagner
OSF Preprints
A Modular Taxonomy for Hate Speech Definitions and Its Impact on Zero-Shot LLM Classification Performance
Matteo Melis, Gabriella Lapesa, Dennis Assenmacher
Proceedings of the The 9th Workshop on Online Abuse and Harms (WOAH), Association for Computational Linguistics, pp. 490--521
2024
You Are a Bot!--Studying the Development of Bot Accusations on Twitter
Dennis Assenmacher, Leon Fröhling, Claudia Wagner
Proceedings of the International AAAI Conference on Web and Social Media, Vol. 18, pp. 113--125
The Unseen Targets of Hate: A Systematic Review of Hateful Communication Datasets
Zehui Yu, Indira Sen, Dennis Assenmacher, Mattia Samory, Leon Fröhling, Christina Dahn, Debora Nozza, Claudia Wagner
Social Science Computer Review
Sexism Detection on a Data Diet
Rabiraj Bandyopadhyay, Dennis Assenmacher, Jose M. Alonso-Moral, Claudia Wagner
Companion Publication of the 16th ACM Web Science Conference, Association for Computing Machinery, pp. 94–102
Multilingual Bot Accusations: How Different Linguistic Contexts Shape Perceptions of Social Bots
Leon Fröhling, Xiaofei Li, Dennis Assenmacher
Proceedings of the 4th Workshop on Computational Linguistics for the Political and Social Sciences, Association for Computational Lingustics
AI-Generated Faces in the Real World: A Large-Scale Case Study of Twitter Profile Images
Jonas Ricker, Dennis Assenmacher, Thorsten Holz, Asja Fischer, Erwin Quiring
Proceedings of the 27th International Symposium on Research in Attacks, Intrusions and Defenses, Association for Computing Machinery, pp. 513–530
A Systematic Review of the Effects of AI-Assisted Moderation on Individuals and Groups
Zehui Yu, Lukas Otto, Dennis Assenmacher, Claudia Wagner
Human-Machine Communication, Vol. 9, No. 1, pp. 10
2023
The End of the Rehydration Era The Problem of Sharing Harmful Twitter Research Data
Dennis Assenmacher, Indira Sen, Leon Fröhling, Claudia Wagner
Workshop Proceedings of the International AAAI Conference on Web and Social Media, Vol. 17, pp. 1093--1101
People Make Better Edits: Measuring the Efficacy of LLM-Generated Counterfactually Augmented Data for Harmful Language Detection
Indira Sen, Dennis Assenmacher, Mattia Samory, Isabelle Augenstein, Wil van der Aalst, Claudia Wagner
Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing, Association for Computational Linguistics, pp. 10480--10504
Just Another Day on Twitter: A Complete 24 Hours of Twitter Data
Jürgen Pfeffer, Daniel Matter, Kokil Jaidka, Onur Varol, Afra Mashhadi, Jana Lasser, Dennis Assenmacher, Siqi Wu, Diyi Yang, Cornelia Brantner, Daniel M. Romero, Jahna Otterbacher, Carsten Schwemmer, Kenneth Joseph, David Garcia, Fred Morstatter
Proceedings of the International AAAI Conference on Web and Social Media, Vol. 17, No. 1, pp. 1073-1081
Invasion@ Ukraine: Providing and Describing a Twitter Streaming Dataset That Captures the Outbreak of War Between Russia and Ukraine in 2022
Janina Susanne Pohl, Simon Markmann, Dennis Assenmacher, Christian Grimme
Proceedings of the International AAAI Conference on Web and Social Media, Vol. 17, pp. 1093--1101
2022
Textual One-Pass Stream Clustering with Automated Distance Threshold Adaption
Dennis Assenmacher, Heike Trautmann
Intelligent Information and Database Systems: 14th Asian Conference, ACIIDS 2022, Springer-Verlag, pp. 3–16
Artificial Social Media Campaign Creation for Benchmarking and Challenging Detection Approaches
Janina Susanne Pohl, Dennis Assenmacher, Moritz Vincent Seiler, Heike Trautmann, Christian Grimme
Workshop Proceedings of the 16^th International Conference on Web and Social Media
2021
RP-Mod & RP-Crowd: Moderator- and Crowd-Annotated German News Comment Datasets
Dennis Assenmacher, Marco Niemann, Kilian Muller, Moritz Seiler, Dennis Riehle, Heike Trautmann, Heike Trautmann
Proceedings of the Neural Information Processing Systems Track on Datasets and Benchmarks, Vol. 1
Benchmarking Crisis in Social Media Analytics: A Solution for the Data-Sharing Problem
Dennis Assenmacher, Derek Weber, Mike Preuss, André Calero Valdez, Alison Bradshaw, Björn Ross, Stefano Cresci, Heike Trautmann, Frank Neumann, Christian Grimme
Social Science Computer Review
2020
Towards Real-Time and Unsupervised Campaign Detection in Social Media
Dennis Assenmacher, Lena Adam, Heike Trautmann, Christian Grimme
FLAIRS 2020 - Proceedings of the 33rd International Florida Artificial Intelligence Research Society Conference, AAAI Press, pp. 303-306
Demystifying Social Bots: On the Intelligence of Automated Social Media Actors
Dennis Assenmacher, Lena Clever, Lena Frischlich, Thorsten Quandt, Heike Trautmann, Christian Grimme
Social Media + Society
Building an Integrated Comment Moderation System -- Towards a Semi-automatic Moderation Tool
Dennis M. Riehle, Marco Niemann, Jens Brunk, Dennis Assenmacher, Heike Trautmann, Jorg Becker
Social Computing and Social Media. Participation, User Experience, Consumer Experience, and Applications of Social Computing, Springer International Publishing, pp. 71--86
Abusive Comments in Online Media and How to Fight Them
Marco Niemann, Jens Welsing, Dennis M Riehle, Jens Brunk, Dennis Assenmacher, Jörg Becker
Disinformation in Open Online Media, Springer International Publishing, pp. 122--137
A Two-Phase Framework for Detecting Manipulation Campaigns in Social Media
Dennis Assenmacher, Lena Clever, Janina Susanne Pohl, Heike Trautmann, Christian Grimme
Social Computing and Social Media. Design, Ethics, User Behavior, and Social Network Analysis, Springer International Publishing, pp. 201--214
2018
Changing Perspectives: Is It Sufficient to Detect Social Bots?
Christian Grimme, Dennis Assenmacher, Lena Adam
Social Computing and Social Media. User Experience and Behavior, Springer International Publishing, pp. 445--461
2017
Stream Clustering of Chat Messages with Applications to Twitch Streams
Matthias Carnein, Dennis Assenmacher, Heike Trautmann
Proceedings of the 36th International Conference on Conceptual Modeling (ER '17), Springer International Publishing, pp. 79--88
An Empirical Comparison of Stream Clustering Algorithms
Matthias Carnein, Dennis Assenmacher, Heike Trautmann
Proceedings of the ACM International Conference on Computing Frontiers (CF '17), pp. 361--365