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At the beginning of the COVID-19 pandemic, the urge to find a cure triggeredan international race to repurpose known drugs. Chloroquine, and nextHydroxychloroquine, emerged quickly as a promising treatment. While laterclinical studies demonstrated its inefficacy and possible dangerous sideeffects, the drug caused heated and politicized debates at an internationalscale, and social media appeared to play a crucial role in those controversies.Nevertheless, the situation was largely different between countries. While someof them rejected quickly this treatment as France, others relied on it fortheir national policies, as Brazil. There is a need to better understand howsuch international controversies unfold in different national context. To studythe relation between the international controversy and its national dynamics,we analyze those debates on Hydroxychloroquine on the French-speaking part ofTwitter, focusing on the relation between francophone European and Africancountries. The analysis of the geographic dimension of the debate revealed theinformation flow across countries through Twitter's retweet hypergraph. Tensordecomposition of hashtag use across time points out that debates are linked tothe local political choices. We demonstrate that the controversial debates findtheir center in Europe, in particular in France, while francophone Africa has alower participation to the debates, following their early adoption of thefamiliar Hydroxychloroquine and rejection of WHO recommendations.

Temporal and geographic analysis of the Hydroxychloroquine controversy in the French Twittosphere