Accounts purporting to be associated with the antifa movement tweeted violent threats in advance of the holiday.

Far-right activists descend on Portland weekly and usually bring violence, including a very notable killing in May 2017. Local antifascists come out to defend minority communities and other vulnerable people. National media usually overlook the context and keep falling for the far-right narrative. Here's how a disinformation campaign went mainstream.

Canada's political conversations on Twitter are overrun by bots and other inauthentic activity, according to a leading social-media researcher, who warns that the activity being detected may be "the canary in the coal mine" when it comes to online manipulation.

From videos hyping the fictitious threat of creeping Sharia law in Canada to posts warning that Muslims would take over Canada and destroy the country if they weren't stopped, this so-called "news network" was actually much more like the website of a hate group than a news organization. Facebook removed the page after a National Observer investigation.