5,000 users with follower-followee relationships are chosen and the authors crawled down 1,438,826 tweets displayed by these users during the period from Oct.2009 to early Jan.2010. Each day is regarded as a time point. Document is obtained by simply concatenating all tweets displayed by the user in certain day. The connection is defined as the number of tweets displayed by user by following another user during the period of 30 days.
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