An older article, but a good one.
From the article:
"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.
"The stochastic terrorist is the person who is responsible for the incitement. For example they go on radio or television and stir up hatred toward a particular person or group."