I imagine if any technical measures taken to combat disinformation, it would be more or less like what China did here.
The only thing they need to do is that if a post that went viral is debunked, they need to show a retraction to users that have engaged with the fake content.
Deleting the content means some people think that it's a conspiracy ("they don't want you to know"), whereas giving corrective information allows people to revisit their beliefs.