This is a good, short primer on the use of social media misinformation, by a former FBI agent who wrote a book, "Messing With the Enemy: Surviving in a Social Media World of Hackers, Terrorists, Russians, and Fake News".
(It's not saying anything radically new, but draws things together well and is about 5 mins long. Useful for sharing if needed.)
www.msnbc.com/brian-williams/watch/why-russia-knew-its-2016-misinformation-campaign-would-work-1245141059865
[The Russia government] perfected it on their own people first. The Russian people are the ones most subjected to this disinformation system. They learned long ago that the only thing worse than no information is too much information. This is how they went from the Soviet Union where they controlled everything to Russia now where they just annihilate you with so much information you can't tell fact from fiction.
The other thing that the Russian information system really understands is, infiltrate audiences by looking like and talking like the audience you want to influence. So that's why the troll farm, those accounts are so important because they look like Americans and they talk like Americans and they're saying things that sound very American which allows you then nudge that audience in the direction that you want.
He then talks about American organisations doing the same thing, and the global alt-right.