The set of citizens concerned by this stuff is not the same set as those taken in by fake news on Facebook. So the concerned types spending less time on Faceboo

The set of citizens concerned by this stuff is not the same set as those taken in by fake news on Facebook. So the concerned types spending less time on Facebook won't solve anything. And I think the Arab Spring shows your dismissive characterisation of Facebook is way, way off the mark. You're right that people using it as a primary news source are doing everything else wrong too. They apparently are, including voting for ill-suited demagogues and regressive causes. That is the problem to be addressed.