I'm sure the Chinese already have a network of informants and surveillance to gather "evidence". A system like this that just terminates calls is probably meant to slow the organization of mass protests. They probably figure that a near-spontaneous protest can be reduced in size or eliminated by making it take longer to get the word out. If people are angry about a specific incident, days or even hours of delay will make cooler heads prevail.
I doubt the Chinese would approach this in such a blunt manner. But I'm sure the Chinese government has lists of known and likely dissidents, and they probably have access to social network graphs for those individuals.
So you monitor likely dissidents who are hubs of major social networks more aggressively. For people who present randomly marginal political risk or low impact because of a limited social network, they get monitored less aggressively or with random sampling, etc.
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I'm sure the Chinese already have a network of informants and surveillance to gather "evidence". A system like this that just terminates calls is probably meant to slow the organization of mass protests. They probably figure that a near-spontaneous protest can be reduced in size or eliminated by making it take longer to get the word out. If people are angry about a specific incident, days or even hours of delay will make cooler heads prevail.
I doubt the Chinese would approach this in such a blunt manner. But I'm sure the Chinese government has lists of known and likely dissidents, and they probably have access to social network graphs for those individuals.
So you monitor likely dissidents who are hubs of major social networks more aggressively. For people who present randomly marginal political risk or low impact because of a limited social network, they get monitored less aggressively or with random sampling, etc.