The Facebook created the Ad Library (Facebook ads archive) to give users more information about some of the ads they see and the advertisers who fund them. 
At new website that created the largest social network you can search for ads related to the policy or issues of national importance.
The Results will include ads viewed by people on USA, Brazil and the UK on Facebook and Instagram.
Currently, the Facebook ads archive contains only ads that have been shown by people in the US, Brazil, and the United Kingdom.
The new Facebook ads archive, according to the company, contains advertisements for elected officials and candidates for public offices, as well as advertisements for issues of national importance, on the websites being viewed.
Facebook has begun this year (2018) to collect ads, and according to the company it will store them for 7 years.
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