Why blog?

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BBS News has an article suggesting that most youth are no longer interested in blogging, instead using micro-blogging as a source of communication. The article also suggests those over 30 are blogging more. So why the separation? I have a theory:

As we get older we start to forget things and writing them down (blogging) helps us retrace the intricacies of what we did. When I started blogging in 2004 on blogger.com it was to help me recall some of the steps to do things like activate a particular Microsoft wireless card I had in Ubuntu. Doing so required steps I needed to remember, but typically wouldn't use during my daily Linux use. I also wanted to solicit other's ideas about some of my weird technology, the Sun Enterprise 2 server for example..

I see a problem with micro-blogging, it gives micro-solutions. Reading micro-blogging solutions is like trying to follow 100 conversations in a busy IRC channel. It may come to the point that we filter micro-blogging content to give solutions, but to me longer blog posts that I can follow step-by-step make more sense.