I want my own hosted Wiki so its fully under my control, but would like something as advanced as Wikia rather than the plain, feature-lacking Wikipedia style MediaWiki.
What software does Wikia use and can I have that for my own hosted Wiki? Is it just upgraded/added-on MediaWiki.
You can find Wikia's customizations and extensions to MediaWiki at their dev wiki.
They keep most of their tweaked code in a publicly-accessible SVN server, linked there.