And this paper I think is really interesting because it shows sometimes I will say to people, "There were things that we did at Facebook that many other companies have also found, and there are a number of things in this paper that dovetail with that idea that these aren't just things that Meta found. It talks a little bit about content level surveys or item level surveys versus user level surveys and, what are the actual practical things that you can do to replace engagement incentives with quality incentives?