Why it’s so hard to fight extremist propaganda online
Clip: 09/07/2016 | 8m 44s
How do you deter people from being seduced by messages of extremism on social media? Science correspondent Miles O’Brien looks at some of the strategies, including videos that provide a counter-narrative to the Islamic State and a computer program that uses digital signatures to track the movement of images on the internet.
Aired: 09/07/16
