Social Network Analysis - Influence Maximization

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I would like to find the k most influential nodes for maximizing the information diffusion. I select the nodes based on high degree and nodes belonging to different communities. I would like to increase the priority of nodes having recent timestamp value. How can I consider timestamp value to increase the selecting probability of a node?

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Sandman On

Is your question actually: how to quantify a timestamp? Maybe it helps you to kind of turn it into a score. For example: (node_timestamp - oldest_known_timestamp) / (now - oldest_known_timestamp) would give you a score from 0 to 1 where 0 is the worst and 1 is the best score