@ARTICLE { AUTHOR = "Ayme Arango and Jorge P{\'e}rez and B{\'a}rbara Poblete", TITLE ="Hate Speech Detection is not as Easy as you may Think: A Closer Look at Model Validation (Extended Version)", JOURNAL = "Information Systems", VOLUME = "105", YEAR = "2021", PUBLISHER = "Elsevier Science", ADDRESS = "Amsterdam, The Netherlands", ISSN = "0306-4379" }