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"Since the events of 9/11, terrorist presence online has multiplied tenfold," says Hsinchun Chen, director of the University of Arizona's Artificial Intelligence Lab. "Around the year 2000, there were 70 to 80 core terrorist sites online; now there are at least 7000 to 8000."
Those sites are doing everything from spreading militant propaganda to offering insurgency advice to plotting the next wave of attacks, making the net, as Chen also points out: "arguably the most powerful tool for spreading extremist violence around the world."