Overall agreed K447, I think my own search for the lines is more for deciding on ways to counter the issue. In my mind currently, it's a different response to the paid Russian trolls spreading propaganda compared to the response needed for people in the US creating or spreading fake news, and those two responses may be different then the solution for another aspect of the issue linked below. The content looks the same, but the approaches to counter them I believe needs to be different.

Additional news stories that are showing other aspects of the problem:

Samantha Bee's team interviews a fake news creator in the US

Another way Google's platform has helped spread fake news, and Google's initial response.

The above though is focusing on the sources and how it spreads. You then also have the part of the issue dealing with why fake news is able to have the impact it has. This story looks at how susceptible students are, including a nod to the advertising point you raised.