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It's like in chemistry - you have a hump of activation energy required to start a process, and then it self perpetuates from the energy generated. Think striking a match - the phosphor is unstable, but you can carry a match about in your pocket quite safely, but when struck it starts the flame which grows exponentially.
Crowds are the same - you need an event that gets the revolution moving.
As Xerx says, that's often a leader.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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