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what_is_twitter__a_social_network_or_a_news_media

'what_is_twitter__a_social_network_or_a_news_media'
What is Twitter, a Social Network or a News Media? Haewoon Kwak, Changhyun Lee, Hosung Park, and Sue Moon Department of Computer Science, KAIST 335 Gwahangno, Yuseong-gu, Daejeon, Korea {haewoon, chlee, hosung}@an.kaist.ac.kr, sbmoon@kaist.edu ABSTRACT Twitter, a microblogging service less than three years old, com- mands more than 41 million users as of July 2009 and is growing fast. Twitter users tweet about any topic within the 140-character limit and follow others to receive their tweets. The goal of this paper is to study the topological characteristics of Twitter and its power as a new medium of information sharing. WehavecrawledtheentireTwittersiteandobtained 41.7million user profi les, 1.47 billion social relations, 4,262 trending topics, and 106 million tweets. In its follower-following topology analysis we have found a non-power-law follower distribution, a short effec- tive diameter, and low reciprocity, which all mark a deviation from known characteristics of human social networks [28]. In order to identifyinfl uentialsonTwitter, wehaverankedusersbythenumber of followers and by PageRank and found two rankings to be sim- ilar. Ranking by retweets differs from the previous two rankings, indicating a gap in infl uence inferred from the number of followers and that from the popularity of one’s tweets. We have analyzed the tweets of top trending topics and reported on their temporal behav- ior and user participation. We have classifi ed the trending topics based on the active period and the tweets and show that the ma- jority (over 85%) of topics are headline news or persistent news in nature. A closer look at retweets reveals that any retweeted tweet is to reach an average of 1,000 users no matter what the number of followers is of the original tweet. Once retweeted, a tweet gets retweeted almost instantly on next hops, signifying fast diffusion of information after the 1st retweet. To the best of our knowledge this work is the fi rst quantitative study on the entire Twittersphere and information diffusion on it. Categories and Subject Descriptors J.4 [Computer Applications]: Social and behavioral sciences General Terms Human Factors, Measurement Keywords Twitter, Online social network, Reciprocity, Homophily, Degree of separation, Retweet, Information diffusion, Infl uential, PageRank Copyright is held by the International World Wide Web Conference Com- mittee (IW3C2). Distribution of these papers is limited to classroom use, and personal use by others. WWW 2010, April 26–30, 2010, Raleigh, North Carolina, USA. ACM 978-1-60558-799-8/10/04. 1.INTRODUCTION Twitter, a microblogging service, has emerged as a new medium in spotlight through recent happenings, such as an American stu- dent jailed in Egypt and the US Airways plane crash on the Hudson river. Twitter users follow others or are followed. Unlike on most online social networking sites, such as Facebook or MySpace, the relationship of following and being followed requires no reciproc
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