A trigger warning or a content warning is intended to enable individuals to make an informed decision about whether to expose themselves to potentially distressing content. We introduce trigger warning assignment as a multilabel classification task and create the Webis Trigger Warning Corpus (WTWC), the first dataset of 1 million fanfiction works from the Archive of our Own with up to 36 different warnings per document. To provide a reliable catalog of trigger warnings, we carefully mapped institutionally-recommended trigger warnings against the millions of free-form tags assigned by fanfiction authors and organized them into the first comprehensive taxonomy of trigger warnings.


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