After its micro-blogging service proved vital in disasters like Hurricane Sandy, Twitter offers a special crisis alert system for mobile users.
Twitter, which is preparing for its initial public offering, said on Wednesday it will help users receive special alerts from government agencies and aid agencies during emergencies.
Users who sign up will receive smartphone notifications via the Twitter app as well as SMS text messages - assuming they agree to handover their cell phone numbers - from any of several dozen agencies who have signed on to the program.
The alerts program starts a year after Twitter showcased its potential as a lifeline during Hurricane Sandy, when stranded residents on the eastern U.S. seaboard reported the storm's progress and sought help on the mobile network.
A similar lifeline service played a part in the rescue efforts in Japan following the devastating 2011 tsunami, Twitter said. The program is initially available in the United States, Japan and Korea and will be expanded to other countries.