[EL] Any responses/analysis about PNAS-reported study on effect of Russian Disinformation?

[Barnaby Zall]

About to comment on the research published in Proceedings of the National Academy of Sciences on November 25 by Christopher A. Bail, et al., "Assessing the Russian Internet Research Agency’s impact on the political attitudes and behaviors of American Twitter users in late 2017," https://www.pnas.org/content/early/2019/11/20/1906420116. 
Excerpt:"We find no evidence that interacting with these [Russian Internet Research Agency] accounts substantially impacted 6 political attitudes and behaviors. Descriptively, interactions with trolls were most common among individuals who use Twitter frequently, have strong social-media “echo chambers,” and high interest in politics. These results suggest Americans may not be easily susceptible to online influence campaigns, but leave unanswered important questions about the impact of Russia’s campaign on misinformation, political discourse, and 2016 presidential election campaign dynamics."

Been a couple of weeks and I haven't seen much substantive coverage of this study. Seems to add something to the string of recent research questioning the effectiveness of almost all forms of communicating with voters. See,e.g.: Brendan Nyan, "Fake News and Bots May Be Worrisome, but Their Political Power Is Overblown," New York Times, Feb. 13, 2018 ("most forms of political persuasion seem to have little effect at all"),  https://www.nytimes.com/2018/02/13/upshot/fake-news-and-bots-may-be-worrisome-but-their-political-power-is-overblown.html;  Joshua Kalla and David Broockman, “The Minimal Persuasive Effects of Campaign Contact in General Elections: Evidence from 49 Field Experiments,” American Political Science Review (2017) ("Our best estimate of the direct effects of campaign contact on Americans’ candidate choices in general elections is essentially zero.").  
I note that the November study didn't include independent voters, who often make the difference, particularly in close elections, and that it was conducted after the 2016 election (which may be good or bad in testing effectiveness). Best analysis I've seen is from MIT Technology Review: "the results challenge some assumptions about the power of these Russian bot accounts. They suggest that the IRA, at least, may not have been especially effective, and that voters may not be as susceptible as many people fear." https://www.technologyreview.com/f/614756/russia-disinformation-twitter-internet-research-agency-social-media-politics/  
Have there been any other useful analyses or comments on this latest "troll" study, not picked up by Altmetric?
Thanks in advance,
Barnaby ZallFriday Harbor, Washington
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://webshare.law.ucla.edu/Listservs/law-election/attachments/20191209/68b63311/attachment.html>