A recent study out of the University of Wisconsin-Madison found that more than half of the sponsors of Facebook ads that featured divisive political messages ahead of the 2016 election were from “suspicious” groups with little or no paper trail to identify them. One in six turned out to be linked to the IRA.“I expected that we would find some unknown actors in the digital media political campaign landscape, because there are some regulatory loopholes,” Young Mie Kim, the study’s lead author, recently told me. “The findings are a lot worse than I thought. It is shocking and surprising.”