At least three things are required for any mass political change to happen:
A critical mass of people taking proactive, organized action.
A chunk of people who may not be organized, but who will join a proactive, organize action.
A chunk of people who may not take proactive steps, but who aren't going to go to the mat for the old regime.
2 and 3 are probably the most important -- they're essentially the difference between an interest group and a mass movement -- and probably the hardest for modern intelligence to stop. They try (look at social media astroturfing and legacy media influence), but your propaganda line can only deviate so much from reality before people reject it. Other comments address accomplishing 1 despite interference.
At least three things are required for any mass political change to happen:
2 and 3 are probably the most important -- they're essentially the difference between an interest group and a mass movement -- and probably the hardest for modern intelligence to stop. They try (look at social media astroturfing and legacy media influence), but your propaganda line can only deviate so much from reality before people reject it. Other comments address accomplishing 1 despite interference.