Those Twitter users who sign up will be on the receiving end of smartphone notifications via the Twitter app in addition to SMS text messages, although this does come with its very own caveat, that is, users will have to agree to hand over their cell phone numbers. The text messages received can be from any of the agencies that have already agreed to sign up with Twitter’s program. Some of those who are part of this program include the U.S. Federal Emergency Management Agency, Tokyo’s Disaster Prevention service and the World Health Organization. Better late than never, and you cannot quite tell just how useful such an alert system would come in during those split second moments when the world around you as you know it is irrevocably changed.