They might if several sets of tracking information end up there, because people are blocking the cookies they might otherwise be in for instance, and each set o

They might if several sets of tracking information end up there, because people are blocking the cookies they might otherwise be in for instance, and each set of tracking info has an identifier or few. The length of UUIDs will multiply up quite quickly there. Not that people will care. Once a URL is longer than a few words plus a code most users won't even look, even if they bother that far. You'll be in danger of starting to hit some browser/server/proxy limits though. Not that I mind that sort of information being lost, I'm happy for the incessant tracking of everyone's everything these days needs to go to hell.