If I'm writing about the website at https://superuser.com/, and I wish to refer to it by name, should I call it:

 * Super User
 * SuperUser
 * Superuser
 * superuser

Or something else?

(Context: I'm modifying [a tag wiki on another SE site][1] to include a pointer to SU, and I figured I might as well check to see how you folks prefer the name to be styled.)


  [1]: http://anime.stackexchange.com/tags/technology