There are 'darknets' which are hosted on dynamic FTPs, direct download sites, botnets, IRC, P2P with encryption, TOR, usenet, and probably some other older, now hardly used protocols. There are still physical places on earth where you can host virtually anything (with the exception of stuff against the ruling regime) and that probably has a lot of that too, while botnets are also used as storage. Whenever you read stories about black hat hackers and criminals you hear of credit card exchanges, sales of CC, banking and SSN details, virus repositories, places where software crackers upload or distribute their cracks and warez and so on and on.... so there is a 'dark' net out there and you probably have to know someone to get in or hang out in all the right places.
Should kids looking for Hana Montana really rub virtual shoulders with such people? I don't think so.
There's also something else to take into perspective - the deep web. When you do a GOOGLE search, you can get 10,000,000 hits. However, you can only browse the first 50 pages of results. You can't see what the 2 millionth hit will be. Not possible. Yahoo allows you to go a bit deeper but even Yahoo is limited and reaches nowhere near the real depth of the internet.