Would you ever guess that one of the factors behind the “success” of ISIS is the way they utilise social media?
Most of the other terrorist groups, especially the Islamic ones, consider social media as a wrong thing from the west, while ISIS is connecting with its followers and recruiting new ones through twitter and other websites.
This is just one of the things that differentiate ISIS from other groups. But there are more.
To understand the origins and core beliefs of ISIS, I would recommend “The ISIS Apocalypse”, while to know more about daily operations of the group, “ISIS: The State of Terror” is a perfect match.