https://techcrunch.com/2018/11/07/facebook-is-facing-an-eu-data-probe-over-fake-ads/

The UK’s privacy watchdog has asked Facebook’s lead EU regulator to look into ongoing data protection concerns about its ad platform — including how its platform is being used to target and spread fake adverts to try to manipulate voters.

Facebook’s international HQ is in Ireland so the regulator in play here is the Irish Data Protection Commission.