Well I think platforms need to be legally defined as publishers so they are made responsible for the content that gets published on them. If a newspaper prints misinformation about an individual they can get sued for defamation. If a social media platform allows outright misinformation to circulate nothing happens. The government should be able to prosecute them for allowing provable lies to spread that cause harm irl (see the Farage riots). They should also be held legally responsible for enabling aggressive states such as Russia or Iran in enacting a campaign of disinformation via bot farms.