Jason Annas clears up the mystery of proper Twitter etiquette, because some people spend way too much time thinking about the process and not doing. I know this firsthand. Since I've been pondering for months what to post on Twitter, my account remains dormant. Ironically, without sending one tweet, I have gained followers (go figure).
So, for those who have procrastinated too long, Annas suggests creating a "swipe file" of users, which he explains in the post. Choosing five Twitters accounts to model, he analyzes the stats from each in a tool called Twitter-Friends. This will tell him how many tweets the person posts daily, the number of replies they send, and more.