Twitter is like global instant messaging that can be sent from any mobile device. It's a new fad that's growing very quickly. Companies and news organizations use it to broadcast updates with links to their sites. I follow a few such as NASA, Boy Scouts (Yes, they launched a Twitter feed last Friday), and Miles O'Brian (former CNN corrispondent) Like anything in life, some folks take it to the extreme and leads to a loss of social skills. I have seen a room full of kids, all friends, standing in silence as they text messages to others, both in the room and someplace else. The Borg have arrived.

BTW, I would not be surprised that a service like Twitter finds its way into PLBs to allow lost folks the ability to communicate with their rescuers.