There are two tools that people use to rank themselves on Twitter; Twinfluence and Twitter Grader. A couple of weeks ago Mashable wrote an article about how to improve your rank and the criteria that each tool uses to rank you.
While I have tested the tools, I have not broadcast my scores on Twitter, which many people seem to do. And I have good scores, I just don’t see the point. I have wondered why people do tweet the score that they received.