Jürgen Pfeffer


Hate Speech Classification in Bulgarian
Radoslav Ralev | Jürgen Pfeffer
Proceedings of the 5th International Conference on Computational Linguistics in Bulgaria (CLIB 2022)

In recent years, we have seen a surge in the propagation of online hate speech on social media platforms. According to a multitude of sources such as the European Council, hate speech can lead to acts of violence and conflict on a broader scale. That has led to in- creased awareness by governments, companies, and the scientific community, and although the field is relatively new, there have been considerable advancements in the field as a result of the collective effort. Despite the increasingly better results, most of the research focuses on the more popular languages (i.e., English, German, or Arabic), whereas less popular languages such as Bulgarian and other Balkan languages have been neglected. We have aggregated a real-world dataset from Bulgarian online forums and manually annotated 108,142 sentences. About 1.74% of which can be described with the categories racism, sexism, rudeness, and profanity. We then developed and evaluated various classifiers on the dataset and found that a support vector machine with a linear kernel trained on character-level TF-IDF features is the best model. Our work can be seen as another piece in the puzzle to building a strong foundation for future work on hate speech classification in Bulgarian.


Finding Eyewitness Tweets During Crises
Fred Morstatter | Nichola Lubold | Heather Pon-Barry | Jürgen Pfeffer | Huan Liu
Proceedings of the ACL 2014 Workshop on Language Technologies and Computational Social Science