Categories and categories of categories are alphabetized. They are a work in progress and many wiki pages are not categorized. Some wiki pages do not belong in any category.
Definitions
Communities refers to a well-established online group of people on a certain platform, with the name of that platform serving as the name of the topic. Subject categories refers to particular subjects that either do not correspond to a particular online community or are notable in their own right. Identifiers refers to labels that designate the tone or purpose of an article.
General subjects are self-explanatory; they are broad subjects which do not correspond to a particular community.
Meta indicates that the article directly has to do with the wiki. Serious indicates that the article is factual and should be taken seriously.