Beginning in September 2021, The Wall Street Journal published The Facebook Files, "based on a review of internal Facebook documents, including research reports, online employee discussions and drafts of presentations to senior management."[15][2][3] The investigation is a multi-part series, with nine reports including an examination of exemptions for high-profile users, impacts on youth, the impacts of its 2018 algorithm changes, weaknesses in the response to human trafficking and drug cartels, vaccine misinformation, and Haugen, who gathered the documents that supported the investigative reports.[15]