Excerpted from article intro:
"...doing research on huge datasets of hundreds of thousands and millions of rows to reach best practice conclusions. And those conclusions are great for experimentation with specific brands and audiences.
But the real power comes when you begin analyzing your own, individual sets of data so you can find out what kinds of content, timing, and behaviors work best for your specific audience.
Enter RetweetLab.com! Using this free tool, you can analyze any Twitter account -- including your account or a competitor's account -- to unearth the data you need to get more retweets. The tool works by allowing you to compare your current behaviors (the small graphs in the text) with the behaviors that are correlated with your account getting more retweets."
Read full article how you can use this new, free tool to analyze and improve your own Twitter presence.
Official website: http://retweetlab.com