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We describe the fourth edition of the CheckThat! Lab, part of the 2021Conference and Labs of the Evaluation Forum (CLEF). The lab evaluatestechnology supporting tasks related to factuality, and covers Arabic,Bulgarian, English, Spanish, and Turkish. Task 1 asks to predict which posts ina Twitter stream are worth fact-checking, focusing on COVID-19 and politics (inall five languages). Task 2 asks to determine whether a claim in a tweet can beverified 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 atrank k for the ranking tasks, and macro-F1 for the classification tasks. Thiswas 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 officialruns for tasks 1, 2, and 3, respectively.

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