It's not hard to find frightening examples of malware which steals personal information, sometimes for the purpose of making it public and at other times for profit. Details such as names, addresses and emails are hugely valuable for companies wanting to market their wares.

But there is another class of information associated with networks that is potentially much more valuable: the pattern of links between individuals and their behavior in the network--how often they email or call each other, how information spreads between them and so on.

Why is this more valuable?

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