Hours after polls closed on Nov. 3, angry Donald Trump supporters on Facebook coalesced around a rallying cry now synonymous with the siege on the U.S. Capitol: "Stop the Steal."

Inside Facebook, employees were watching with concern.

The presidential election may have passed without major incident, but in its wake, "angry vitriol and a slew of conspiracy theories" were fomenting, Facebook staff wrote in an internal report on the Stop the Steal movement earlier this year. Supporters perpetuated the lie that the election had been stolen from then-President Donald Trump — a lie that Trump himself had been stoking for months.

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