Overview of the CLEF--2021 CheckThat! Lab on Detecting Check-Worthy Claims, Previously Fact-Checked Claims, and Fake News

CLEF-2021 We describe the fourth edition of the CheckThat! Lab, part of the 2021 Conference and Labs of the Evaluation Forum (CLEF). The lab evaluates technology supporting tasks related to factuality, and covers Arabic, Bulgarian, English, Spanish, and Turkish. Task 1 asks to predict which posts in...

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Bibliographic Details
Main Authors:	Nakov, Preslav, Martino, Giovanni Da San, Elsayed, Tamer, Barrón-Cedeño, Alberto, Míguez, Rubén, Shaar, Shaden, Alam, Firoj, Haouari, Fatima, Hasanain, Maram, Mansour, Watheq, Hamdan, Bayan, Ali, Zien Sheikh, Babulkov, Nikolay, Nikolov, Alex, Shahi, Gautam Kishore, Struß, Julia Maria, Mandl, Thomas, Kutlu, Mucahid, Kartal, Yavuz Selim
Format:	Journal Article
Language:	English
Published:	23-09-2021
Subjects:	Computer Science - Computation and Language Computer Science - Information Retrieval Computer Science - Learning Computer Science - Social and Information Networks
Online Access:	Get full text
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Summary:	CLEF-2021 We describe the fourth edition of the CheckThat! Lab, part of the 2021 Conference and Labs of the Evaluation Forum (CLEF). The lab evaluates technology supporting tasks related to factuality, and covers Arabic, Bulgarian, English, Spanish, and Turkish. Task 1 asks to predict which posts in a Twitter stream are worth fact-checking, focusing on COVID-19 and politics (in all five languages). Task 2 asks to determine whether a claim in a tweet can be verified using a set of previously fact-checked claims (in Arabic and English). Task 3 asks to predict the veracity of a news article and its topical domain (in English). The evaluation is based on mean average precision or precision at rank k for the ranking tasks, and macro-F1 for the classification tasks. This was the most popular CLEF-2021 lab in terms of team registrations: 132 teams. Nearly one-third of them participated: 15, 5, and 25 teams submitted official runs for tasks 1, 2, and 3, respectively.
DOI:	10.48550/arxiv.2109.12987