On Aug. 4, 2021, Instagram’s fact-checkers removed a post about the drug ivermectin. The post had come from the Cochrane Library, a highly respected international organization that collates and summarizes medical research. After thoroughly reviewing available data, Cochrane had told their followers they had found no evidence to support ivermectin as a treatment for Covid-19.Surely Instagram’s fact-checkers had made a mistake? Cochrane appealed the decision; almost a year later, they finally rece...