SevenCubed - 1:57 am on Dec 5, 2012 (gmt 0)
I did find something interesting from that link SEOPTI threw in. On that page we can click a pin "See recent tweets on Bing Twitter Maps". Zoom out to the world view and you can see the areas where twitter is most popular. Not much action from my neck of the woods. But I guess population proportion to last 100 tweets has to be taken into account.