T-@npi: A twitter-based safety confirmation system

Since the Great East Japan Earthquake of March 11, 2011, disaster-related information through sharing social media has been gathering attention. We have studied a Twitter-based safety confirmation system named “T-@npi” as a web application, which is accessible by any web browser on any devices connecting to the Internet. The system enables users to submit and confirm safety information on Twitter easily. This paper reports an outline and improvement of the system.