This becomes more relevant every day: The Twitter Platform’s Inflection Point http://www.avc.com/a_vc/2010/04/the-twitter-platform.html
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
This becomes more relevant every day: The Twitter Platform’s Inflection Point http://www.avc.com/a_vc/2010/04/the-twitter-platform.html