Abstract: This paper develops a full account of the nature of disinformation as ignorance-generating content. The view, if correct, carries high stakes upshots, both theoretically and practically. First, it challenges several widely spread theoretical assumptions about disinformation – such as that it is a species of information, a species of misinformation, essentially false or misleading, essentially intended/aimed/having the function of generating false beliefs in/misleading hearers. Secondly, it shows that the challenges faced by disinformation tracking in practice go well beyond mere fact checking.