During the Oregon wildfires of September 2020, rumors spread locally and nationally that left wing activists were responsible. The evidence for so-called “antifa” involvement was based on a series of misidentifications and inference by public officials. The rumor received additional amplification from partisan influencers on the far right, fake antifa Twitter accounts, anonymous trolling communities on 4chan, the QAnon conspiracy network, and late stage attention from President Trump.
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Source: Misidentification: How The #Antifafires Rumor Caught On Like Wildfire | Media Manipulation Casebook