Dark Web

There is a "Dark Web" within the internet on private networks that are usually through encrypted connections that supply the dirtiest of porn, illegal gun and weapons sales, stolen merchandise and you can even hire a hitman to kill somebody! It exist as sad as that is. These networks that may or may not be on what we call the internet but rather a private network using encryption methods to pass files and chat to one another. This may sound over-hyped but it almost certainly exist in my opinion with all the sick cretins out there. I can understand reasonable gun trading/buying that is within a law that the people themselves voted on but selling extreme weapons that are beyond just guns can be a problem. Networks that are hidden from most people on the internet could deal in everything from sick child pornography and other forms of harmful extreme porn, to hitmen killing people for money. I know it sounds paranoid but networks like this exist. I haven't seen a case of someone doing these things but from what I understand the networks that are private and encrypted do exist and I have heard of trading of various things. Here are three articles related to what I have summed up in this post:
Dark Web
Article 1: http://www.nsf.gov/news/news_summ.jsp?cntn_id=110040
Article 2: http://www.infowars.com/new-regulation-frontier-the-dark-web/
Article 3: http://www.smh.com.au/technology/technology-news/the-new-underbelly-20120531-1zktt.html