I was going to say this is a great idea but totally unfeasible due to the amount of cooperation required, enough people simply won't do it, but parts of it are kind of happening by default. e.g. with BS news stories and whatnot. Also I suppose a lot of it could be automated - fighting fire with fire in a way. I'm sure that would lead to a cat-and-mouse game of creating code for detecting and ignoring intentionally obfuscating content, then the other side coding their way around those detection systems, and then back and forth like that forever, similar to the pattern of: finding exploit -> patching exploit -> finding new exploit -> patching new exploit -> etc.