and we do have the iab, the internet advertising bureau, but they're effectiveness is limited, i guess. so i'm really curious about that. and then, margaret, i wanted to pick up on something you said and, katie, i was reminded by your work on kind of the way that government regulation has advanced around cable television, i was thinking about the way that telecom policy evolved, the way that broadcast regulatory policy evolved and i've been thinking lately about the silicon valley idea of iteration. because that is an idea that i do really like. i like the idea that, okay, we can try something and see if it works and then if it doesn't, then you try to do better. and i think that the way that this fits with the law. because the law evolves, the law is the original artifact that iterates, right. even the constitution, we have iterations of the constitution. so i wonder if, when it comes to regulating the social media platforms, we should regulate and then iterate. let go of the idea we have to get it right on the first try, and let's just try something. because doing nothing doesn't see