SAN FRANCISCO — Facebook’s team of content reviewers focused mainly on violence and pornography, making it “incredibly easy” for Russian trolls to fly under the radar with their fake news, according to a former Facebook content monitor who worked at the social network for eight months in the lead-up to the 2016 U.S. presidential election.

“As long as these stories didn’t contain anything pornographic or incredibly violent, they [would] be left alone, because Facebook has billions of users and there’s no way that the content moderators are going to peruse every single news article for valid facts,” Sarah Katz,

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