A new study reveals that terrorist organizations are largely uninterested in using resources and services hosted on the dark web. Terrorists use the web for propaganda and recruiting, two goals that could be easily achieved by using social media platforms such as Twitter and Facebook. Law enforcement and intelligence agencies fear that the rise of the Islamic State will be associated with an increasing use of the anonymizing networks that makes hard investigations hard. The darknets propaganda reach is starkly limited, not least because novices may be deterred by taking an illicit step early on.”]
Source: https://securityaffairs.co/wordpress/45755/terrorism/dark-web.html