From traditional to digital media, the growing number of false information, hoaxes or rumors have recently crystalized in the formulas “fake news” or “alternative facts”. These formulas reveal that the public sphere experiences complex epistemological processes, an even more complex relationship to truth, argumentation, facts and a profound modification of alethurgies. In this article, we first propose to establish a typology of different “false information” and their relationship to truth in a techno-semiotic perspective. We will then apply this model on famous fake examples that circulated during the US presidential campaign in order to deploy the methodology. Finally, we observe how these different types of false information and forgeries were used during the 2017 French presidential election, culminating in the so-called “Macronleaks” and how some actors deconstructed them. By submitting these fake to the veridictory process they demonstrated an interesting form of “semiologic clairvoyance”.