When I logged in to it at 5:54 I saw something interesting on pop up on Twitter. the popup said “Tweet with your location”. The feature says “Turning on location allows Twitter to display your location information (like neighborhood, town, or exact point) with your tweets.”.
It saves the exact coordinates. If you click turn on location a window pops up saying “twitter.com wants to know your location.” and you can choose to share it or not to share it. When I enabled this it doesn’t say my exact location down to the city, state, and coordinates. It looks like to me it only goes by your ISP location. You don’t have to share your location with other people and I don’t even know why they implemented this feature. If you don’t want your location shared just click don’t share or remove your location from the tweet. Remember, they won’t do it unless you give them permission.