«Voters in Pennsylvania, Virginia, and Wisconsin, all states with tight races, were the most targeted. Specifically, voters in Wisconsin were targeted with gun ads about 72 percent more often than the national average. She also found that white voters received 87 percent of all immigration ads. It makes sense that swing states would be more heavily targeted overall leading up to an election. And Kim didn’t analyze the Russians trolls’ targets independently from the other unregulated ads, given the small sample size of 19 groups».

Source : How Russian Facebook Ads Divided and Targeted US Voters Before the 2016 Election | WIRED