e.g., mattcutts.sys-con.com/node/662965, ajax.sys-con.com/node/662965, iphone.sys-con.com/node/662965, and many others (CC @mattcutts)
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
e.g., mattcutts.sys-con.com/node/662965, ajax.sys-con.com/node/662965, iphone.sys-con.com/node/662965, and many others (CC @mattcutts)