If you believe in what you're saying, stand behind it. Do not allow yourself to be bullied or shouted down.
Be truthful. Be honest. Be respectful. On the other side there is also a human being.
Believe in yourself.
To speak is not enough; you must also lead by your actions. Be the change - in word and deed.
Be open. To possibility, to change, to debate, to discussion.
Embrace technology. We live in a golden age of mass communication, where free and inexpensive tools enable anyone and everyone to potentially reach millions in an instant. Experiment with new technologies. Keep what works.
Ask questions. Seek understanding. Educate yourself.
Be calm, especially when there is chaos all around you.
Believe in, in the words of Lincoln, "the better angels of our nature".
What would you add?