We use text messaging the same way Gatorboy and Boomerang1 mention. Those situations where information is sent with no reply needed. Replying to text messages or composing emails on a cell phone, or even a device like a BlackBerry (I have both), is tedious.
Having worked with computers (all sizes) for my entire career I've gone from 'You have to be home to take support calls and drive into work to fix', to pagers, to cell phones, to PDAs, to BlackBerrys which allow you to remotely handle many support issues wirelessly. Issues that used to require on site support or, at a minimum, be at home tied to a PC, can now be handled from wherever you are. /forums/images/graemlins/tongue.gif (this can be good and bad!)
As with any form of communication, those who find it valuable are the Sender and Receiver. What Observers think of it is, well, irrelevant. /forums/images/graemlins/smile.gif Had we had cell phones, wireless PDAs, etc. when we were teenagers I imagine we would have used them in much the same fashion. I know my Dad thought most of my teenage conversations on the phone (rotary dial) were worthless. "You're tieing up the phone line. Get off. What can you be talking about for so long?" /forums/images/graemlins/grin.gif Heck, my Dad probably thought most of the phone conversations my Mom had were worthless. /forums/images/graemlins/shocked.gif Although, if he did, he never said anything. Remember, most men communicate to transfer information, while women usually communicate to build relationships. These days, we have more communication options, which is good.