One of the new features Twitter announced is called points of interest. People on Twitter have been able to include their general location. But now they will be able to reveal exactly where they are. People will be able to search for a certain location, like a concert hall or hotel, and see all the posts written from that spot.
This is similar to the check-ins on Foursquare, Gowalla and other services that people use to share their location. Mr. Williams said that Twitter was not trying to duplicate those services but rather provide Twitter users with more relevant content.
“Where you are defines what you’re interested in,” he said.
via nytimes.com