The MAIN text structure of this paragraph is Cause and Effect.
This is true because in the paragraph, we discover that President Mubarak took steps to shut down people's means of digital communication. But that pushed the people to use their real voices since their cyber voices has been closed down. Also, as the people saw that they have been cut off from the outside world, they turned against their president.
This actually is a Cause and Effect event. Their president's action led to their reaction.
"Cause and effect" is known to be a relationship between events or things, where one event leads or results to the other or others. It is like an action leading to a reaction.
