Keeping up with the 21st Century

I'm never really understood why people blogged; I still don't quite understand. Do people blog because they have such wonderful things to say to contribute to the rest of the world? Is it to make themselves feel important knowing that others are reading? Is it to organize one's thought by articulating it (like you do in therapies)? Or is it record keeping (like scrap booking)? Whatever the reason... now I am attempting to be a part of it. Maybe I'll discover the phenomena behind blogging.