What location information does Twitter store?
Similarly to how we store the time stamp that says when the Tweet was made, Twitter stores the location information that is publicly displayed with a Tweet for as long as the Tweet exists (or until you click the “clear my location history” button on the Settings page as described here). If you chose to tweet with a place, but not to share your exact coordinates, Twitter still needs to use your coordinates to determine your Place. In order to improve the accuracy of our geolocation systems (for example, the way we define neighborhoods and places), Twitter will temporarily store those coordinates for 6 months.
