I think the comment about the phone makes sense, in that you have to constantly check your e-mail, as opposed to the phone rings you. People spend hours a day looking at their crack berries, you don't spend hours a day looking at your phone waiting for it to ring. Unless, in fact, someone you want to hear from.
I get the logic, I personally, am coming to hate this super connected world, it's like an electron forced to share it's orbit, it's just not good. YOu don't ever seem to have a moment to yourself through this constant flood of information, the TV, radio, cell phone, smart phone, black berry, berry black, phone i, i pad, i pod, you are always connected, constantly, it's like the Borg, ... or that Japan Anime Serial Experiments Lane, social networking will morph into reality and the real world, essentially becomes just a back drop to living on the net.
It's actually quite scary. My most peaceful moments now a days are when no one can contact me, it's damn near exhilirating...
And look at Tiger, if it wasn't for that darn, Text messaging!!!