CNN CNN International May 6, 2015 05:07:00
They have very little risk in doing so. one of the reasons theyre effective, the use of social media. theyve mastered the media. they know the lingo. if you look at terrorism traditionally, it tends to be a group phenomenon. for somebody to carry out acts of extremism and acts of terrorism, you might lose your life and youll probably go to prison for the rest of your life, it takes hardened beliefs. groups tend to harden peoples beliefs, further them on to action and stop them from backing outs....
Source: archive.org