I would agree with delta. I write to make the jumble of thoughts in my head move into an area where it can be formed into cohesiveness. But depending on what it is, I also write to be acknowledged, in a way. By that I mean, I aim to create discussion about a topic I'm thinking about. But one thing I've learned to improve my writing is to write for myself, first. I find that I can be bogged down by worry of what other people think about my writing/opinions. By writing for myself, I can also write honestly, which I believe is an important thing to me.
I think it's an interesting idea that all commenters on Hubksi are writers. We all express our views through our words, and it's pretty damn beautiful. You should write for yourself first, then open that writing up to the public. That's how you'll make waves.