Facebook reportedly had a fake news fix, but was too afraid to use it -

"A new report says Facebook shelved an update that would have suppressed fake news from going viral on the social network. According to Gizmodo, high-ranking Facebook executives were briefed on an update that identified fake news and hoaxes, but the tool was never released in fears of “upsetting conservatives.”"

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Facebook reportedly had a fake news fix, but was too afraid to use it - The Verge