The Big Lie
When people hear those words, "the big lie", they think of elections. They don't think of the internet. I believe if people put things on the internet, they should be forced to state whether it is an opinion or a verifiable fact. If they don't, they get a warning from an AI. If they continue to ignore the AI warning, they are warned that the blog will be deleted unless the writer appeals within a specified period of time. Wikipedia is already doing this to some extent when they ask for so called facts to be cited. Or, internet providers need to divide their content clearly into fact-based news and opinion pieces, much like newspapers used to do before the rules for newspapers stopped working properly. They must make their websites clearly divided so people can't confuse fiction from fact. People who purposely try the challenge or defraud this system can be fined or jailed enough so that the potential gain from breaking the law is neutralized.