ideomatic, colloquial english, who can appeal to americans to join their cause. they know how to persuade them. they know how to speak to them. and they know how to really inspire them to become a part of it. >> and top u.s. officials like fbi director robert mueller says the internet acts as an accelerant to terrorist activity. >> consider someone like anwar ala which, the american-born extremist. ten years ago, he would have operated in relative obscurity. today on the internet, he has unlimited reach to individuals around the world, including those here at home. >> a u.s. counterterrorism official tells cnn they're aware of the publication, saying it aims to provoke the murder of innocents and hardly lives up to its name, "inspire." you travelers out there get on the plane, you know you've got the first class. you've got business class. you've got coach class. how would you like flying in the cuddle class?