Although some people might argue there are plenty of legitimate reasons to browse the dark web, systems like those will be abused sooner or later. Depending on how many media headlines one can bear to read, the dark web is nothing more than a collection of underground marketplaces for drugs, stolen financial information, and who knows what else. Bitcoin plays an integral part in this machine as well, as it remains to – alleged – preferred method of payment for internet criminals.
The Department of Justice, together with Homeland Security, USPS, and the IRS have been able to arrest one man selling drugs via the dark web. Accessing these underground marketplaces requires special software – called Tor – which lets users access the part of the Internet that is not indexed by search engines.
http://www.newsbtc.com/2016/03/30/former-silk-road-member-arrested-selling-drugs-dark-web/