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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
Thanks for reaching out to us. Your subs can double check if they've opted in to receive 'all' notifications instead of the 'occasional' option. Also, here's how they can check the device level notifications: https://goo.gl/Yec28H