I actually ran a full character-level diff with move detection over the entire wikipedia edit history (few thousand machines) back in ~2008. The vast majority

I actually ran a full character-level diff with move detection over the entire wikipedia edit history (few thousand machines) back in ~2008. The vast majority of content was created by a long tail of users, with a very small minority of users being the last to "touch" a particular piece of text (copy edits, moving things around, etc). Probably should have published that.