Influence on Twitter

Interesting blog post summarizing recent research measuring user influence in Twitter. Click through to the research paper for some interesting insights. Quoting from the abstract:

First, popular users who have high indegree are not necessarily influential in terms of spawning retweets or mentions. Second, most influential users can hold significant influence over
a variety of topics. Third, influence is not gained spontaneously or accidentally, but through concerted effort such as limiting tweets to a single topic.