Disinformation Strategies: Fake News and Fact-Checking Disinformation, a defining phenomenon of our time, is absolutely transversal, impossible to reduce to a specific discipline or social sphere. An issue that is one of the main concerns of national security agencies around the world and that, in the professional field, poses important development and reorganization challenges in all fields, from Public Relations, Journalism, Advertising or Marketing, to Medicine or Public Health, through Sociology, Political Science, Law or Economics and Business. A crisis, led by the infodemic (Bennett and Livingston, 2018; European Commission, 2018), with effects such as the lack of confidence in the quality of the information received (Van-Aelst et al....