The report
does establish that social media brigading occurred.
https://www.dni.gov/files/documents/ICA_2017_01.pdf p. 4:
> Russia used trolls as well as RT as part of its influence efforts to denigrate Secretary Clinton. This effort amplified stories on scandals about Secretary Clinton and the role of WikiLeaks in the election campaign.
Continuing:
> A journalist who is a leading expert on the Internet Research Agency claimed that some social media accounts that appear to be tied to Russia’s professional trolls—because they previously were devoted to supporting Russian actions in Ukraine—started to advocate for President-elect Trump as early as December 2015
I will use those two quotes to provide context for my research.