Interesting report on the involvement on the internet on drug use + distribution, quite unbiased tbh and quite positive about the impact of the darknet harm reduction wise.
http://www.emcdda.europa.eu/system/files/publications/2155/TDXD16001ENN_FINAL.pdf
http://www.emcdda.europa.eu/system/files/publications/2155/TDXD16001ENN_FINAL.pdf