https://www.theguardian.com/technology/2019/mar/28/facebook-tightens-up-rules-for-political-advertisers

Verifiable contact details will be required to run campaigns on site ahead of EU elections

Advertisers will be required to provide verifiable public contact details before they can run political campaigns on Facebook, the company has announced, in the latest attempt by the social network to increase accountability for so-called dark adverts.