With the exception of links to a limited list of other Wikis, one of which is Jimmy Wales' for-profit site Wikia. (At least, they used to be exempted from nofol

With the exception of links to a limited list of other Wikis, one of which is Jimmy Wales' for-profit site Wikia. (At least, they used to be exempted from nofollow, it's possible that's changed at some point.)