Gizmo reports on a group text application, called Text Mobs. Users sign up for groups of their choice (private, secret or public) and get SMS’d all messages sent to that group.
It’s currently offered as a free, web-based service by MIT’s Computing Culture Group, who developed it.
It’s a similar concept to the thriving Upoc, based in New York.
Examples of services using this might be, celebrity spotting, gossip, news or just three or four friends having a group chat.