content: It is possible to filter majority of the population. Not everyone is as educated as you. For instance, when I first went to China, everything is blocked, I have to learn how to use a bridge in Tor. (Tor is blocked, tor website is blocked.) I have to learn how to bypass VPN payment systems etc. etc. because I failed to configure a SSH/VPN outside of China. Even when I did bypass the block, my brother complains Facebook is slow as hell and unusable. The chinese government limits connection speed too, making VPN/Encryption difficult, unless you are a gamer. Maybe!!