Thanks to a tip from my colleague Dani I learned that Factiva has recently added a filter for fake news. Like many things with Factiva (IMHO), it's not terribly intuitive to find, so here are the steps. You can either add this as a filter to a search you've already run, or just use it to see what all is out (in) there.
From the main search page choose Subject, then Political/General News, and finally, Fake News Phenomenon. If you simply click on the blue arrow to the right and then run the search you'll see all there is on the subject within Factiva. According to the scope note, it looks like this category was added on March 14, 2017.
