Figure 9From: Dark Web Marketplaces and COVID-19: before the vaccineWikipedia page visits for pages relative to (a) PPE, (b) hydroxychloroquine, chloroquine and azitrhomycin. Number of tweets mentioning (c) PPE, (d) hydroxychloroquine, chloroquine and azitrhomycin. Panels (a) and (b) corresponds to Fig. 5(a) in the main text, while panels (c) and (d) to Fig. 5(b). The main difference between these panels and Fig. 5(a) and (b) is the linear scale on y axisBack to article page