https://www.cnbc.com/2018/05/24/facebook-and-twitter-announce-stricter-political-ad-guidelines-ahead-of-midterms.html

Facebook and Twitter are clamping down on political ads ahead of the 2018 midterm elections in an effort to close loopholes that were exploited during the 2016 presidential campaign.

As of Thursday, all election and issue-based ads on Facebook and Instagram must be labeled and have a "paid for by" disclaimer. Users can click through to an archive, which will show the campaign budget for that specific ad, how many people saw it, and more details about viewers including age, gender and location. The archive will store this information for seven years.