Wikia

Wikia is an amazing website which allows anyone to create a (worthwhile) wiki.

I say worthwhile becuas eyou have to go through a registering process, which is where you enter your e-mail, user, etc. Then you enter:
 * Your proposed wiki name
 * Your wiki idea
 * your wiki community (who will join)
 * Your wiki logo (optional)

This is then checked by staff who vote in favour or against your idea. Depending on your idea. If it passes, it gets put up for free. And Wikia will make money out of it, the same way that the BBC makes money out of their channels, all of which are on freeview.