Whether because of their age, image or interests, some people just don't seem like likely fans of Twitter's 140-character bursts of wit and wisdom (or ... you know ... other stuff).
In the age of photography, though, it is the image that is the distraction, and if the distracted individual is travelling at speed in a car, such distraction could be fatal.
Do you think that people who grew up in the age of rock videos expect that there's going to be some kind of moving image to watch along with the music?