I'd have thought the time aspect would balance out - after all, if someone in New England sits down and posts something at their 10pm, say, it'll be a longtime before anywhere in Old England is likely to see it.

I know Americans are more spread out - but on the other hand there are a lot more of them around. Something like 300 million now, I read today. So most of them aren't too interested in folk, however you define it, but that's every bit as true in England.