To Tweet or Not to Tweet

I promised another look at an aspect of social networking. People love it, hate it, and everything in between. To tweet or not to tweet? How useful is Twitter for writers? Today's guest, cozy mystery author Elizabeth Spann Craig, weighs in. I'm anticipating some lively conversation in the comment thread./s1600-h/Craig3.png">It used to be that I could say "sign up for Twitter only if you want to."