Extremely popular and commonly adopted croblogging service is not only a new form of conmmnication,but also seen as a place for "fueling" viral marketing. Due to essential openness and growing ubiquity, nucroblogsphere offersrnways to manipulate the trending topics, through arranging a number of "messengers" who send messages and make a push on maxinuzing influence propagation.rn In this paper, we present an initial study on quantify and characterize the events referring to viral campaigns launched in nucroblogsphere. Our study is based on two independent data sets, one corresponds to a event referring to viral campaign and the other can be considered as not planed. We exanunerncollectively dynanuc response of the event referring to viral campaign, in comparison with the event not planed. We find the event referring to viral campaign exhibits different evolving pattern form the other event.Top users with extremely high yield of nucroblogs in the event referring to viral campaignrnhas been proven to account for the exceptional pattern of dynanuc response. We further investigate the individual dynanuc response and calculate the centrality of top users for quantitative characterization of these users. This work ainvs to suggest insights into the evolving of events referring to the viral campaign launched in croblogsphere and the behavior pattern of top users in these events who may donunant the event evolving.
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