Thens had put up the following in his site :-
"I always wondered why people blog. I still havent had a convincing answer."
I quote part of a article :-
"What makes blogs so effective? They're free. They catch people at work, at their desks, when they're alert and thinking and making decisions. Blogs are fresh and often seem to be miles ahead of the mainstream news. Bloggers put up new stuff every day, all day, and there are thousands of them. How are you going to keep anything secret from a thousand Russ Kicks? Blogs have voice and personality. They're human. They come to us not from some mediagenic anchorbot on an air-conditioned sound stage, but from an individual. They represent — no, they are — the voice of the little guy.
The human voice – raw or polite, opinionated, silly or serious and free of corporate restraint – that’s what catches my attention when I’m trolling through blogs. The blogs I go back to again and again are those who’s voice I can relate to. Can blogs have a voice? Yeah, as much any mostly written medium can. Some people are better writers than others, but that’s not the cut off for me. I’m looking for real people who have things to say that interest me. As the Times article points out: “In a way, blogs represent everything the Web was always supposed to be: a mass medium controlled by the masses, in which getting heard depends solely on having something to say and the moxie to say it. "
simply put, it's just place to put something that you wanted to say to somebody who's willing to hear you.