SAN FRANCISCO — Regina Bateson had just finished an Easter egg hunt with her children on April 1 when her phone started buzzing. Take a look at Facebook, messages from her friends and colleagues urged.
Ms. Bateson, a Democrat running for Congress in the California primaryon Tuesday, quickly opened up the social network. There, she saw what appeared to be a news article that painted her as underhandedly trying to torpedo the campaign of a rival Democratic candidate. When Ms. Bateson clicked through the article, she was directed to a Facebook page run by Sierra Nevada Revolution, a local progressive group she had clashed with in the past.
The article was not a news story, she found, but a political ad paid for by Sierra Nevada Revolution. And while Facebook rolled out new rules on April 6 mandating that campaign ads be clearly labeled and say who had purchased them, Sierra Nevada Revolution’s ad about Ms. Bateson continued to be targeted to local voters throughout that month without any of those disclosures.
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