Facebook has known for years about a major source of political vitriol and violent content on its platform and done little about it: individual people who use small collections of accounts to broadcast reams of incendiary posts.

Meet SUMAs: a smattering of accounts run by a single person using their real identity, known internally at Facebook as Single User Multiple Accounts. And a significant swath of them spread so many divisive political posts that they’ve mushroomed into a massive source of the platform’s toxic politics, according to internal company documents and interviews with former employees.

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