I asked this question here a long time ago. Where is the point that you really are in the middle of a propaganda war? I'm fully convinced we are there.
Is Russia one of the countries stirring the pot? Of course they are. We've been messing with them for decades. This shouldn't be a surprise.
I'm quite sure Russia *IS* backing and boosting #WalkAway. Just as they are backing and boosting the #Resist nonsense. They bumped Trump and they bumped Hillary. You boost both sides to spread the dissent. It's textbook. In fact, the US wrote that textbook for unrest.
To me, the real problem is that there are not really any accurate news sources left. The established media players aren't so much free press as they are paid-for press. And the "populist" movements are all in a battle for eyeballs, too. But those eyeballs are limited to them by algorithms controlled by Facebook, Google, Twitter, and the like. And those algorithms can be easily gamed by any group who wants to spend a trivial amount of resources. What was it figured out that it took about $4000 to get something trending? Let's say you want to trend 3 hashtags a month. That's less than $150,000 to wage a year of subtle dissent against your target. You could pick out 6 or 10 a month, even, and see which ones stick. You're still talking less than $1mil a year. That isn't enough to even be considered pocket change to any nation that wants to stir the pot... And that is all it takes to just slightly alter the populist message to your advantage. The long slow boil pays off in 5 or 10 years. And that is all in addition to election laws that do nothing about outside groups shadow funding PACs and buying traditional advertising through conventional channels.