The cat is out of the bag- this stuff works! As most of us here know, fake news is an incredibly tricky problem to address. You tell me the tool that solves it, and I'll tell you how it can be gamed. Democracy's only hope is to build a culture of transparency and healthy skepticism.
Fake news is the symptom, not the disease. The disease is that our society is gullible and emotionally fragile, and the people bombarding us with propaganda know this. Fake news is tuned to our weaknesses and to fix this we need to improve ourselves as a society. If we don't then whatever media comes next will be similarly tuned, and the cycle will repeat itself (again), as it nearly always has. That sounds like a bi…
The human brain is buggy, we're glorified monkeys. You can't tackle societal problems by saying that we need to fix the brains. The history of society and politics is about exploiting those bugs and then, through great deal of effort over centuries, establishing institutions and norms to prevent the exploitation of those bugs.