https://phys.org/news/2019-01-facebook-tighten-political-ad-elections.html

In the US, Britain and Brazil political advertisers must confirm their identity and location before they can run Facebook ads, which are also housed in a public, searchable library for up to seven years.

"By shining a light on political ads, news organizations, regulators, watchdog groups and people anywhere in the world can hold advertisers and us more accountable," it said.