I have a very short answer to the question. It's education. With education, the people in Finland have been going through what news you can believe and how to be critical of all the information to better stop the spread of fake news. I suppose it is one of our strengths that we have very highly educated people in Finland. As well, we have the cultural background, because for decades we have been more or less used to critically looking through the information that we are getting from outside of our borders.
On November 26th, 2018. See this statement in context.