Internet Research Agency Twitter activity predicted 2016 U.S. election polls (2019)Minerva Research Initiative (Department of Defence) at the University of Tennessee. Results: It seems unlikely that 25,000 re-tweets could influence one percent of the electorate in isolation (Guess, et al., 2019; Allcott, et al., 2019), although this might be more plausible than presumed at first glance, given that only about four percent of viewed tweets result in re-retweets (Lee, et al., 2015), such that 25,000 re-tweets could imply about 500,000 exposures to those messages per week. It is more likely, however, that Twitter is just a subset of a larger disinformation campaign carried out on multiple social media platforms (Issac and Wakabayashi, 2017; Howard, et al., 2018), as well as spread through social contagion (Centola, 2010) and to other parts of the interconnected ‘media ecosystem’ including print, radio and television (Benkler, et al., 2018). In this way IRA disinformation can frame the debate, meaning many more people than those directly exposed can be affected (Jamieson, 2018).