"Novel aspects coming from the directionality of online relationships: a case study of Twitter" by Haewoon Kwak, Changhyun Lee, Hosung Park, Hyunwoo Chun and Sue Moon with Ching-man Au Yeung as coordinator

The online relationship in Twitter, known as follow, is directed. People can follow any other person without an approval. In this article we show novel aspects of Twitter that come from the directionality in relationships: topological characteristics of the directed network, word-of-mouth information spreading via retweet, and online relationship dissolution. We wrap up the article with future directions in our information diffusion study.