% of US adults who use Facebook 58% LinkedIn 23 Pinterest 22 Instagram 21 Twitter 19 http://www.pewinternet.org/2015/01/09/social-media-update-2014/ …pic.twitter.com/hKWZDwkYHq
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
@conradhackett at all interested in chatting sometime about how you can publish machine-readable data for people to reuse & viz using APIs?