When George W. Bush decided to invade Iraq one of the main reasons (of the public and politically correct ones) was not only to free the Iraqis from the oppression of Saddam Hussein, but to stop the menace Saddam's Weapons of Mass Destruction (WMD for short) posed to the stability of the Gulf region. After months long of thorough search for said WMDs none was found. Maybe they were looking for the wrong WMD...
If you look at all the civil unrest happening across Arab countries in the last weeks you can clearly see that the ultimate WMD is neither a nerve gas nor a new virus, but Twitter, Facebook and social media in general.