The internet has given us many beautiful things -- it's replete with cute animal photos, myriad videos of people falling, and .gif-studded television recaps, and it's also a place to seek and discover information, a place to consider and refute dissenting opinions, and a link between us and other individuals. This is especially true when it comes to discovering people who share our interests, hobbies, and fetishes. The internet provides just enough (apparent) anonymity and a platform for sharing that people feel comfortable unfolding aspects of themselves usually kept stored away.
And the sense of community and exclusivity offered by the internet has also helped create and cement veritable subcultures. Such as...
Tumblr in partocular has proven a hub for people who support or are simply fascinated by mass shooters (and, sometimes, the line gets hella blurry). In particular, fan communities have sprung up surrounding the likes of Aurora, Colorado shooter James Holmes and Columbine High School shooters Eric Harris and Dylan Klebold. These fans, who share fan art, thoughts, and letters to their favorite mass shooter, call themselves "Holmies" and "Columbiners," respectively.
The internet has afforded fans the opportunity to interact with their favorite book, TV, movie, and comic book characters -- as well as their favorite real-life celebrities -- in a new way. While fan fiction is by no means new, (even the Brontë sisters got in on the action) the communal nature of the internet has allowed these stories to have an audience all their own, usually in online forums. Slash fiction is any work of fan fiction that focuses on the attraction and/or sexual relationships among characters, often of the same sex or gender. Perhaps the most famous (and profitable) example of the genre is 50 Shades of Grey, which began as Twilightfan fiction chronicling the sex lives of protagonists Bella and Edward.
"Furries" is the name given both to highly anthropomorphic animals (in comic books, movies, fan art, etc.) and the people who are their fans, some of whom dress as their favorites for role-playing purposes and/or at conventions. There is, however, community dissention over what exactly constitutes a furry, with alt.lifestyle.furry defining the term as, in part, "a person with an important emotional/spiritual connection with an animal or animals, real, fictional or symbolic." There is a portion of the fandom for whom the attraction to anthropomorphized animals is sexual in nature, and include "yiffing" a term that has changed in meaning over time to now connote a sexual act or sexual material, either online or in person.
Like fan fiction, survivalism isn't new, but it has taken on a new level of influence online. The basic definition of survivalists are those who prepare themselves for an emergency, be it political upheaval or nuclear winter or Judgment Day. Sometimes, these can be the result of religious beliefs. The internet provides many forums for advice and discussion on "prepping" for such catastrophic events and has given rise a distinct vocabulary.