Be careful and complete in your answers. Do some research and provide links to any sources used in your answers. Try to figure out the question underneath the question and answer that question, too. Use personal experience to demonstrate your understanding of the question and to flesh out your answer. Do this as much as possible. The more personal the answer, the easier it is to see where you’re coming from.
Be respectful of others always. Sometimes, this will be impossible. Be funny at such times.
Be honest and revealing of yourself. Be fearless about what you reveal. People respect that a lot. In that vein, make sure you remain anonymous.
Finally, don’t do it unless you’re having a good time.