From the former leaker times, one could see that their censoring mechanism is purely political (CIA, NSA, State Dpt), and less Spam/Quality related. Their censo

From the former leaker times, one could see that their censoring mechanism is purely political (CIA, NSA, State Dpt), and less Spam/Quality related. Their censored blacklist is manually maintained, the quality algorithmicly, that's why it can be gamed easily.