document: Information diffusion through blogspace We study the dynamics of information propagation in environments of low-overhead personal publishing , using a large collection of weblogs over time as our example domain . We characterize and model this collection at two levels . First , we present a macroscopic characterization of topic propagation through our corpus , formalizing the notion of long-running `` chatter '' topics consisting recursively of `` spike '' topics generated by outside world events , or more rarely , by resonances within the community . Second , we present a microscopic characterization of propagation from individual to individual , drawing on the theory of infectious diseases to model the flow . We propose , validate , and employ an algorithm to induce the underlying propagation network from a sequence of posts , and report on the results .
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