"This analysis of digital advertising technology and its relevance to disinformation online is designed to broaden the focus in the current public debate beyond Russian operatives buying ads on social media. The problem is much bigger than that and the issues of concern are more diverse. Our analysis points to the core challenge of disentangling the alignment of interests between the commercial pursuits of digital platform companies and the success of disinformation-based political advertisers. It is a mistake to fixate on Russia. Russia is one of many online disinformation operators targeting Americans. Future disinformation campaigns may just as likely be run by domestic operators as foreign ones. These operators will most likely leverage the most dominant U.S. internet platforms to reach tens upon hundreds of millions of Americans. The full range of these disinformation campaigns could produce a grave public harm. In particular, they can progressively weaken the integrity of our democracy by separating citizens from facts and polarizing our political culture." (Conclusions)