Going full transparent
Facebook's ad library contains data on every active and inactive ad related to politics or issues of importance within the EU that's run since March 2019. They keep each of these ads in the library for seven years.
Detect Fraud Sites and check out your competitor's ads
The ad library is your chance to check out competitiors' ads and get some insights on their marketing. It's also useful to detect fraud sites by looking at the name history. In the picture below you can see all ads ARMEDANGELS is currently running and even filter them by country.