The best rule to use on twitter is to just have fun, give your updates, participate in conversations that interest you, give useful recommendations and just be yourself. You'll notice a surge in how many people follow you and in turn build credibility and trust, making it easier for you in the long run.
You will be using Twitter to share creative events that are happening in your life and how it relates to your career area. At least every other link, you will need to insert a link into the tweet that relates. When you insert a link into twitter, go to www.bit.ly and paste the link into the big box underneath "Shorten with bit.ly" and click "Shorten." Make sure you sign up for a free account first and login.
Need to Know
When you tweet you do not need to:
I read and was inspired by the Iranian government's effort to improve its biomed research centers: http://bit.ly/bv44Z8