Russian-linked Facebook ads targeted Michigan and Wisconsin
https://www.cnn.com/2017/10/03/politics/russian-facebook-ads-michigan-wisconsin/
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"A number of Russian-linked Facebook ads specifically targeted Michigan and Wisconsin, two states crucial to Donald Trump's victory last November, according to four sources with direct knowledge of the situation.
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Michigan saw the closest presidential contest in the country -- Trump beat Democratic nominee Hillary Clinton by about 10,700 votes out of nearly 4.8 million ballots cast. Wisconsin was also one of the tightest states, and Trump won there by only about 22,700 votes. Both states, which Trump carried by less than 1%, were key to his victory in the Electoral College.