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This paper examines how observable and measurable characteristics of the people who originally transmit information in online social networks affect how far that information spreads. Two characteristics are compared: a transmitter's connectivity (how well connected them are in the network) and activity (how frequently they transmit information over their social ties in the network). Despite extensive past research on connectivity (e.g., the literature on hubs), the role played by activity in driving diffusion is largely unexplored.
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