https://www.reuters.com/article/us-facebook-eu-election/facebook-tightens-rules-on-political-ads-ahead-of-eu-vote-idUSKCN1R92VA

Facebook Inc toughened its rules on political advertising in Europe on Friday under pressure from EU regulators to do more to guard against foreign meddling in the bloc's upcoming legislative election. Chastened since Russia used the social media platform to influence polls that swept U.S. President Donald Trump to power, Facebook says it has ploughed resources and staff into safeguarding the ballot across 27 EU nations on May 26.