What Would Make You Follow A LInk On Twitter To Buy A Book?

As I grapple with this whole shameless self promotion thing and try to sell my book [Buy here] 🙂 I am constantly looking for new avenues and better ways to do things.

I have been using Twitter to promote my book, which is good, but I have been trying to figure out some things. So a couple of questions for you;

  1. How often should an author tweet their links? Is there an optimum ratio of sales pitch to interaction? What is overkill?
  2. What makes you follow a link? What’s a good short pitch in 140 characters or less minus hashtags, links and title [there goes 40 characters already]?