Wikia (formerly Wikicities) is a wiki farm founded and run by Wikipedia co-founder Jimmy Wales and Wikimedia Foundation board member Angela Beesley. It has raised millions in investments and reportedly enjoys preferential treatment by Wikipedia.
To get a wiki, one must request one at the Requests Wiki. If it is unique, will most likely draw in contributors and is not a personal project or breaks any rules, it will most likely be accepted. The founder of the wiki automatically gets sysop and bureaucrat rights.