In August, Twitter team announced that is working on a new API that would provide developers with the ability to geotag tweets. Today, the Geotagging API is officially available.
This release is unique in that it’s API-only which means you won’t see any changes on twitter.com, yet. Instead, Twitter applications like Birdfeed, Seesmic Web, Foursquare, Gowalla, Twidroid, Twittelator Pro and others are already supporting this new functionality in interesting ways that include geotagging your tweets and displaying the location from where a tweet was posted. The added information provides valuable context when reading your friends tweets and allows you to better focus in on local conversations.
Geotagging feature is disabled by default for all users which means you will need to opt-in in order to use it. To activate the new geotagging functionality, go to your Settings page and click “Enable Geotagging”.