As far as I can tell, the US has been a follower, not a leader, in these movements. Sure, activists have been trained in the US. That's been the case for decades though, and it took organization and significant change and economic pressure — not brought about by the US — in the region to create an the conditions for change.
I think there are coincidences and occasionally there could be coercion (don't publish on account of national security) but I do not see it as "an organ of the gov't". It's self interest. In other words it's not comparable to XinHua News, as you're implying.
W/re ME revolutions. All those examples were in places where the outcome was nearly inevitable (needed some logistical/moral support) and the US/EU didn't want to appear to be on the 'wrong side' of history. Witness CN and RU. Specially RU tends to pour arms into those conflicts to upset the West, to some extent --I don't fully understand their intent but they are unsuccessful in much but delaying the inevitable.
http://www.nytimes.com/2011/04/15/world/15aid.html?pagewante...
Further documentation on this topic is not hard to find. But feel free to minimize the explicit, acknowledged support of the most powerful country in the world for violent democratic revolution in favor of local "agency". As for whether this article on the #2 leader in China was printed at random, The New York Times has a track record of coordinating with the US government:http://www.nytimes.com/2011/02/22/world/asia/22pakistan.html...
http://www.salon.com/2011/02/21/nyt_16/ In other words, whether under Bush or Obama, the NYT has an acknowledged track record of coordinating with the US government on stories that could result in international incidents. A hit piece on one of the top people in the Chinese government might not have been done at the State Department's request, but it certainly would not have been published over the State Department's objection. The fact that its effect was to sow discontent with China's leadership is not unnoticed by anyone skeptical of US-exported democratic revolution.