Stochastic terrorism is the use of mass communications to incite random actors to carry out violent or terrorist acts that are statistically predictable but individually unpredictable. In short, remote-control murder by lone wolf. This is what occurs when Bin Laden releases a video that stirs random extremists halfway around the globe to commit a bombing or shooting. This is also the term for what Beck, O'Reilly, Hannity, and others do. And this is what led directly and predictably to a number of cases of ideologically-motivated murder similar to the Tucson shootings. As of this writing, there is no evidence to link Jared Loughner to a specific source of incitement; but some of the other cases can be clearly linked.
http://stochasticterrorism.blogspot.ca/