There was an article in a magazine that talked about the Syrian government's strategy. Instead of directly silencing the rebels, they would hack into the leading rebels' various accounts ranging from Gmail to Twitter, or trick the leaders by having agents pose as followers.
They would then either trace the leaders and "disappear" them, or trick the followers into installing spywares onto their computers, and use other sabotages.
As a result, some of the rebels that were interviewed admitted that they were afraid of using the internet, and attempted to counter-act the espionage, such as contacting western security firms to assist in identifying and stopping the new spywares.
The Syrian war isn't just a war. It's also a major cyberwar, with each side trying to gain the advantage over the other.