@SamHarrisOrg Just curious, this one of your slides?pic.twitter.com/XSlNSp2I07
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
@SamHarrisOrg Thought so. It's proven very useful for me. Some people still have a very hard time understanding. Thanks for reply! 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.