Why this blog?

A couple of weeks ago, I saw the movie, "Julie and Julia." The reviews are correct, I would have been happier with just the "Julia" part, but so be it. The "Julie" part was a about a woman who blogged about doing all the recipes in a Julia Child cookbook in one year's time. A part of me thinks that blogging is dumb---who really cares what anyone has to say? Isn't it just 21st century self-absorbtion? The other part of me is this: I keep a non-online journal about nothing specific-just thoughts, books I've read, etc, so why not try on an on-line journal about something specific, in this case, the upcoming school year? Who knows, maybe I'll get some feedback for this blog, which I don't get (or need or desire) for my off-line journal. But that goes back to my original thought about blogging--who really cares what I have to say?