To my knowledge, anti-fake news laws being implemented in France, Germany and Singapore in the Western world. Many studies like this one mention the psychological studies which acknowledge the backfire effect - the effect when people tend to uphold to their views most strongly when their questioned. Several studies have found out social media have been succesful in reducing fake-news reach via their own regulation.
However, I wasn't able to find a study which would evaluate the impact of the existing fake-news social media regulations.
What I would like to find out: Does the regulation seem to be effective in reducing the spread of fake-news or does it help it?