Scientific Web Discourse

Overview of the CLEF-2025 CheckThat! Lab: Subjectivity, fact-checking, claim normalization, and retrieval

CheckThat! 2025 ran four shared tasks that help fact-checkers, from subjectivity detection to numerical claim verification, with 83 teams and more than 20 languages.

Firoj Alam, Julia Maria Struß, Tanmoy Chakraborty, Stefan Dietze, Salim Hafid, Katerina Korre, Arianna Muti, Preslav Nakov, Federico Ruggeri, Sebastian Schellhammer, Vinay Setty, Megha Sundriyal, Konstantin Todorov, V. Venktesh