With ISIS distributing its propaganda and recruiting messages to as many as 200,000 people on social media worldwide, U.S. officials warned Wednesday there is no way to monitor their online encrypted communications.
The officials, appearing before the House Homeland Security Committee, said while there are only several thousand hardcore ISIS propagandists, technology was complicating efforts to monitor them.
"There are 200-plus social media companies. Some of these companies build their business model around end-to-end encryption," said Michael Steinbach, head of the FBI's counterterrorism division.
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