Arab Spring and the powers of social media.

During 2011 many arab countries saw change in their governments. The reason this change was able to take place was because of social media. Protesters would organize the demonstrations on Facebook and then make sure everything was in place on twitter. They would also spread their ideas through youtube to the world. The Governments that were being overthrown even went to the extremes of shutting down social media networks. So this raises the question for me and everybody else. How powerful is social media? If social media has the power to overthrow governments what good could it do in this world?