You might have noticed but I'm a reasonably big Twitter user. Actually, I should be more precise. I'm a reasonably big Twitter API user ... I tend to use Tweetdeck on my mobile devices and on my laptop. I very rarely use Twitter on the web, and so I've only just noticed how Twitter are handling the display of geotagged Tweets. Take a look below and you'll see that on the accompanying map that they're rolling up from the point of the geocode to the nearest administrative geographic entity and highlighting this in a rather fetching shade of transparent red.