Therapists Using Twitter

I like this list. It gives some general guidance for using Twitter for your business. There are some pitfalls about using social media like Twitter, Facebook, MySpace -- For example, how do you handle it when a current or former client "friends" you on Facebook or follows you on Twitter? If they do, their photo (if they've uploaded one) will appear on your page. But if you've decided to jump into the fray anyway - Here are some good suggestions:
http://www.chrisbrogan.com/50-ideas-on-using-twitter-for-business/

If you're a therapist or psychologist using Twitter, what has your experience been?