"There's nothing exceptional about terrorists or violent extremists being on the Internet," he said. "They're on the Internet because everyone else is on the Internet. It'd be very strange if terrorists were the one group of the population that were not on the Internet."
There's been a recent debate in the U.K. and other areas about blocking websites promoting violent extremist, Neumann said. Inspire magazine is typically available from several websites, not just one or two, and followers post it at many others, he said. "Within a couple of hours of this magazine being published, you can download it not just from one location on the Internet, not just from dozens of locations on the Internet, but literally from hundreds of locations," he said.
It's "pointless" to block extremist sites, he said.
Sign up for CIO Asia eNewsletters.