Anime/Manga/Comic conventions/message boards
In so far as a social media subculture, I believe a major one is the anime or comic book conventions and threads. These conventions are held throughout many cities and the message boards are in a mass abundance online. These boards have a variety of sections and topics for members to discuss. In general, it is difficult to tell who the members of the forums are, however, it is easy to discern that there is definitely a type of language for the community. Each community's "language" has many references to the specific anime/manga the board is based on. (I know that sentence is horribly phrased). Anime/Manga/Comic message boards also often reference other Anime/Manga/Comics in general even if the forum isn't based around said work. In anime and manga, sometimes a character's name is slightly different in the Japanese and English versions, generally in the community it is usually preferred when one refers to the character's Japanese/original name.Comments:
1: http://paisleypeterson.wordpress.com/2014/03/28/blog-7-dtc-375/comment-page-1/#comment-46
2: http://themadblackscientist.wordpress.com/2014/03/28/blog-entry-7/comment-page-1/#comment-35