Fangirls: two women charged with plotting ISIS-inspired attacks in New York, April, 2015.
JANE ROSENBERG / AP PHOTO

The Islamic State, or ISIS, is the first terrorist group to hold both physical and digital territory: in addition to the swaths of land it controls in Iraq and Syria, it dominates pockets of the Internet with relative impunity. But it will hardly be the last. Although there are still some fringe terrorist groups in the western Sahel or other rural areas that do not supplement their violence digitally, it is only a matter of time before they also go online. In fact, the next prominent terrorist organization will be more likely to have extensive digital operations than control physical

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