>>headal+(OP)
China had an extensive system to delete disinformation. Every IM, UGC website or app are required by law to provide a report button and ICPs are required to response to user complaints immediately. There's also national wide hotline 12377 or website 12377.gov.cn to submit all categories of information you want to disappear. Any bad content esp. those against-govn't ones contained pretty quickly, which means not only the existing ones, but also prevention of future uploads or posts would be blocked. And the original uploader would be backtraced by "cyberpolice", and jailed if found.
I imagine if any technical measures taken to combat disinformation, it would be more or less like what China did here.