https://www.cnbc.com/2017/09/06/facebook-says-likely-russian-operation-spent-money-on-ads-with-divisive-political-messages.html

An internal Facebook investigation has found it is "likely" Russian operatives spent $100,000 on ads with "divisive messages" between June 2015 and May 2017.

A blog post on the issue, which was published on Wednesday, said the operation involved 3,000 separate ads over a two-year period and was likely to have been run out of Russia. In addition, Facebook found 470 affiliated fake accounts and pages.