wow this visualization. it’s ripping through states differently.pic.twitter.com/OU5AFUxJea
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
should be some kind of ordering that's quasigeographical or includes network distance somehow.
One might say... a social distance metric.
touche 

Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.