https://techcrunch.com/2018/07/26/facebook-finally-hands-over-leave-campaign-brexit-ads/ > The UK parliament has provided another telling glimpse behind the curtain of Facebook’s unregulated ad platform by publishing data on scores of pro-Brexit adverts which it distributed to UK voters during the 2016 referendum on European Union membership. The ads were run on behalf of several vote leave campaigns who paid a third company to use Facebook’s ad targeting tools. > The ads were run prior to Facebook having any disclosure rules for political ads. So there was no way for anyone other than each target recipient to know a particular ad existed or who it was being targeted at.