An investigation by Facebook found Russia spent $100,000 on ads during the 2016 US
presidential election. Whether it violated election law depends on their content. For example, an ad with a candidate’s name breaks election law. Alex Stamos, the chief of security for Facebook, said the majority of the ads focused on politically divisive topics like gun rights, LGBT issues, and race and immigration.
The ads targeted specific geographic locations, which raises the question who provided the data needed to determine where to put the ads. Robert Mueller, the special counsel investigating collusion between the Trump campaign and Russia to win the
election, is likely looking into this.