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'''Wikia, Inc.''' is a {{tag|Wiki company|company}} registered in the State of Delaware, U.S.A. (corporate number C2935209), whose registered office is at 360 3rd Street, Suite 750, {{tag|San Francisco}}, CA 94107, U.S.A.<ref name="Terms" />
[[Wikia|Wikia.com]] uses a unique and heavily modified creation of the {{tag|MediaWiki}} {{tag|Wiki Engine|wiki engine}}; it is visually different from conventional MediaWiki sites (such as Wikipedia) in that it has its own exclusive {{tag|custom skin}}, and most notably, is embedded with a range and variety of graphic and dynamic {{tag|Advertising|advertisements}}. The fundamental business model of Wikia / Fandom is the offering of {{tag|Free MediaWiki wiki farmsfarm|free hosting}} for an individual or community to build a free content [[WhatIsWiki|wiki]]-based website, on virtually any [[:Category:Wiki Topic|subject]]. New wikis can be created instantly at http://www.Wikia.com/Special:CreateNewWiki. Hosting of wiki, and 24 hour customer support is free, in return for advertising placed on the pages; but [[editor]]s and [[user]]s have little say over the advertisements (both content and placement) their wiki site displays. Support, on both the technical and community aspects of running a wiki community, is provided at [[Wikia Community Central]] (or one of its related [[Template:Wikia Community Central|other]] [[:Category:Wiki Language|language]] Community wikis).
[[:Category:Wikia Staff|Wikia staff]] and helpers have [[sysop]] powers throughout <u>all</u> Wikia wikis, as well as several types of automated detection and [[block]]ing tools to help deal with [[vandal]]s and [[spam]] on individual wikis. This can be helpful for [[:Category:Wikis with a strong viewpoint|controversial]] wikis like [[Liberapedia]] which tends to attract vandals.
===Advertising===
Wikia offers {{tag|Free MediaWiki wiki farmsfarm|free hosting}} for a community to build a wiki-based website based on a unique and heavily modified version of {{tag|MediaWiki}}, in return for the display of {{tag|Advertising|advertisements}}. Some registered [[user]]s complain that they have little say over the placement or content of advertisements their wikisite displays.
Logged-in users don't have to see the advertisements unless they choose to. Users may set their preferences to see advertisements on Wikia in order to see how a page looks to logged-out and/or non-registered Wikia users. A prominent advertisement is placed at the top right hand side of most pages, but when there is also a picture on the top right hand side of a page, the layout for users who see the advertisement can be poor especially on short pages. Logged-in users may not realize this when they add pictures.
