https://www.cnbc.com/2018/10/18/political-advertisers-using-facebook-loophole-to-hide-money-sources.html

Despite Facebook's efforts to make political ad funding more transparent, loopholes enable ad buyers to remain relatively anonymous.

Facebook announced in May a new tool to promote political advertising transparency on the site. But a series of news stories over the past few weeks reveal that political advertisers are exploiting loopholes in Facebook's system to obscure the source of their funding.