A List Apart article with footnotes?! http://www.alistapart.com/articles/infrequently-asked-questions-of-faqs/#FOOTNOTE-1
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
A List Apart article with footnotes?! http://www.alistapart.com/articles/infrequently-asked-questions-of-faqs/#FOOTNOTE-1