https://www.theguardian.com/technology/2017/sep/06/facebook-political-ads-russia-us-election-trump-clinton

Facebook said on Wednesday that it had found that an influence operation likely based in Russia spent $100,000 on ads promoting divisive social and political messages in a two-year-period through May.

The social media network said that many of the ads promoted 470 “inauthentic” accounts and pages that it has now suspended. The ads spread polarizing views on topics including immigration, race and gay rights, instead of backing a particular political candidate, it said.