Facebook has removed more than 130 accounts, pages and groups it says were part of a UK-based misinformation network.
The company said it was the first time it had taken down a UK-based group targeting messages at British citizens.
The same group set up pages posing both as far-right outlets and anti-fascist activists.
Facebook said it had shared its discovery with law enforcement and the government.
The group was able to gain followers by setting up innocent-looking pages and groups. It later renamed them, and started posting politically-motivated content.
MP Damian Collins, who chairs a committee investigating fake news, said it was the “tip of the iceberg”.
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