I see a pattern here. People shoot the tools for the uses people make of them.
My generation does a lot of blogging, social networking, stuff like this. These things have more than one purpose. I regularly read a couple of designers' Twitter entries because they share their recent discoveries or reflexions, which are very interesting. But then, flooding the web, is a mass of self-centric twitter users who have nothing more to do than tell the Internet how their day went.
One thing I see about the older generations, is that everyone has a car. Two cars. Three cars. And I'm not talking about automotive enthusiasts. People have more than one car per family member, counting the baby.
Some will buy a HUGE Chevrolet Avalanche to get the groceries once a week and drive the kid to school.
This doesn't make any more sense than zealous social networking on Internet, or tight pants. But people do it. Out of boredom, to feel secure, or because they think it makes them a better person. Or because everyone does it.