A few weeks ago I was talking to a fellow professor, also married with children, who didn't have a cell phone. I tried to explain how having cell phones transformed our lives, no longer did we have to coordinate in advance. The other professor seemed unconvinced. It's very hard to convince someone who doesn't use a technology why one cannot live without it.
Of course I didn't tell him the story of when our family split up in a museum and then the entire AT&T network went down in the state. It took us 45 minutes after the museum closed to find each other.
So far I have avoided Twitter, either following others or writing my own, even though I already have three followers to my empty Twitter feed. I actually worry that I don't have enough time for another tool I can't live without.