https://www.reuters.com/article/us-usa-election-facebook/senator-warner-asks-facebook-to-be-more-transparent-on-political-ad-policy-idUSKBN1X820Q >U.S. Senator Mark Warner called on Facebook Inc to provide more transparency over its decision to not fact-check ads run by politicians, asking whether it would comply with a new rule that requires online platforms to disclose the purchasers of ads.