There are a number of factors that go into the recommendation system. It's worthwhile noting that the weighting that occurs around news and information content is different from, say, entertainment content. Initially, the recommendations were actually built more for entertainment content such as music, etc. It actually works extremely well for that.
When it was applied to news and information, it became more apparent that there were some challenges, which is actually why we changed the weighting system. What that means, again, is looking at the factor once we evaluate the video and then at what's the authoritativeness: overweighting for authoritativeness and under-weighting for information that isn't necessarily going to be authoritative or trustworthy.
That is very contextual. It depends on the specifics of whether you're signed in or not. The information is available on your watch time. It's based on information about the video you're watching, on the kind of video that other people have liked to watch and on what are the other videos that people who have liked this video like to watch, etc. This is why it actually is dynamic and will constantly evolve and change.
In addition to making tweaks and changes to that system over time to ensure that we're actually providing more authoritative information in the case of news and information, we're also adding additional contextual pieces, whereby we'll actually have clear flags, labels and contextual boxes to indicate when there is subject matter or individuals that are frequently subject to misinformation. For example, there's the conspiracy theory issue that you raised.
Essentially, if you see a video that may be suggesting vaccine hesitation or so on and so forth, you'll get information saying that this is not actually confirmed by science and that gives more contextual information about what that video is covering. The same thing applies to things like 9/11 conspiracy theories and so on and so forth. This will be an ongoing process.
Mostly, we want to make sure that even if a user is seeing information, they're actually given context so they can properly evaluate it themselves.