The new “features” function highlights Tweets that have occurred around a specific location. Twitter.com and mobile users can tag their existing tweets (existing Twitter Places) and add new Twitter Places.
The application lets users search recent public Tweets from their current location and view nearby points of interest information such as restaurants or clubs in the area. Not sure if you want to go see that DJ at the hottest nightspot in town? Just check to see if any users are Tweeting about it, now you have immediate reviews and other information for locations found directly in your area.