Today, in the age of the internet, during recent epidemics such as H1N1, Ebola and Covid-19, it is striking to see how old accusatory scripts are circulated and perpetuated via social media, which serve as new channels for discrimination and blame directed at traditional figures who have been scapegoated at different moments in the history of European epidemics. The article shows how the laundering of information into a cliquey network takes empirical shape during a health crisis. We do so by focusing on VKontakte, a Russian social network similar to Facebook and the 15th largest website in the world in terms of traffic. Using an ethnographic approach to social media, we show how borderline information from an open and easily accessible website is reappropriated, made explicit, and transformed into legally prohibited hate content. It also documents the ability of conspiracy theorists to use the full range of discourse production channels in a country—in this case France—that has very strict laws on hate speech, including that published on social networks. These laws are circumvented by anti-Semitic communities that spread false information in marginal, open and legal networks, thus avoiding legal proceedings.