I recommend reading this fun NY Times article on how the internet has affected the spread of slang. Since the point of using slang is to separate from the actually cool people from the wannabes and the internet makes knowledge of slang available to all wannabes, fairly quickly do slang words cease to be slang and enter the greater cultural vernacular*. The article discusses the spread of slang, the role of slang in social identification, inter-group slang transfer, and the evolution of slang with respect to internet technologies. As a total slang goon, I found this article to be hella rad.
* This might actually be why I create my own slang and abuse the polymorphic term "goon." Only my real friends will pick up the appropriate ways to use my slang. ;)