That is my point, unless the content is identical, any tiny change and I don't see how your going to know it is the same page as another when you have billions/

That is my point, unless the content is identical, any tiny change and I don't see how your going to know it is the same page as another when you have billions/trillions of pages to compare against. I also don't think this makes sense on a fundamental level, if I write some excellent content it shouldn't be harder to find because I wrote it recently. We would be making it harder for new entrants and encouraging people to rush out low quality content/ even report on things before they happen and delete the incorrect guesses later (not that the current system isn't full of perverse incentives.)