Twitter forbids users from posting threats of violence against others. But there are thousands of accounts talking favorably about the so-called Islamic State and helping to spread their message. RT's Anastasia Churkina looks at why those running Twitter are finding it so hard to clamp down on the rogue users.
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RT (Russia Today) is a global news network broadcasting from Moscow and Washington studios. RT is the first news channel to break the 1 billion YouTube views benchmark.