It's this online "mystery." Basically you start at
www.thisisnotporn.com and try to figure out the (extremely oblique) clues to get to the next page. Some are just finding the right spot to click on, some are entering in the right username and password at a page login prompt.
A vast number of the clues are based on this one book, and I personally suspect it's all a marketing ploy to sell more copies. I had some fun with it, right up until the point I had to buy something. Then I lost interest real quick.