The fight against Islamic State jihadists is taking place online as well on the battlefield, with 18,000 Twitter accounts linked to the group suspended in recent months, according to a US expert.
IS supporters "are under significant pressure, with the most active and viral users taking the brunt of the suspensions" J. M. Berger, a fellow at the Brookings Institution who tracks militants on social media, told lawmakers on Tuesday.
Twitter has suspended nearly 800 confirmed IS accounts since the fall of last year but this "may be the tip of the iceberg," as almost 18,000 accounts "related" to the jihadist network were suspended over the same time period, according to a forthcoming survey by Berger and another expert, Jonathon Morgan.
Although tens of thousands of Twitter accounts remain online, advocates for the IS group online have called the suspensions "devastating," Berger told the House Committee on Foreign Affairs.
The IS group had been able to operate on social media with relative ease until recently.
But -- after IS released a grisly video in August of the beheading of American journalist James Foley -- Twitter, Facebook and YouTube have instituted stricter rules to ferret out posts that support "terrorism," he said.
The suspensions have targeted the most active Twitter accounts, hampering the IS group's propaganda efforts, but has left intact less active accounts -- enabling spy agencies to monitor the group's backers, according to Berger.
"I believe the current environment is approaching the right balance of pressure on ISIS networks, degrading its ability to achieve its goals while still allowing the United States to exploit open source intelligence from the network of members and supporters online," he said.
There are at least 45,000 Twitter accounts used by IS supporters, including those created and suspended in recent months, he said.
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