[jobigoud]

One avenue that has been taken by Youtube for example with the Coronavirus news is to not try to detect lies/truths but just detect the controversial topic and add a banner under the video with a link to official sources. It's much simpler to implement. A disadvantage is that it becomes so ubiquitous that people probably don't care about the link.

[mcintyre1994]

At least they try to detect the topic. Reddit's app has for some time been permanently showing a "look at /r/coronavirus" banner at the top of the default Home tab. I'm not exactly sure how they're moderating that or whatever, but the fact it's there all the time doesn't seem to reduce conspiracies flying around the rest of their site and they don't make any effort to attach it to them posts.