Giving location information to Twitter is an opt-in process. To enable Twitter’s function to add geographic information to your tweets, you simply have to hop over to the Account section at Twitter.com.
Scroll down and you’ll find the location section of the Twitter settings. There’s a checkbox to enable geotagging and big friendly button that will allow you to delete all your historical location data, just in case your being tracked by assassins or you know, just relish your privacy.
Twitter’s geolocation features do not actually work on Twitter.com yet however but will rolled out as part of third party applications like Tweetdeck over the next few weeks.
The addition of geolocation information to tweets should also mean that Twitter is able to create more effective local lists of trending topics.
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