Twitter lauched "Twitter Places" on twitter.com and mobile.twitter.com. "You can tag Tweets with specific places, including all World Cup stadiums in South Africa, and create new Twitter Places. You can also click Twitter Place within a Tweet to see recent Tweets from a particular location. Over the next week, we'll roll this out to users in 65 countries around the world, so keep an eye out for the "Add your location" link below the Tweet box," said Twitter.
Foursquare and Gowalla integration: Many Foursquare and Gowalla users publish check-ins to Twitter. Location is a key component of these Tweets. This means that if you click on a Twitter Place, such as "Ritual Roasters," you'll see standard Tweets and check-ins from Foursquare and Gowalla.
Released API functionality that lets developers integrate Twitter Places into their apps.
Support for more browsers: Now, you can add location to your Tweets from any browser—Safari and Internet Explorer, in addition to Chrome or Firefox