This page exists because certain programmers/organizations are dumb. Facebook is one.
Facebook, if my webpage was designed to accept query strings, and if I wanted users to browse to my website with tracking data embedded in the URL, I'd have put that data there myself.
My web server software is set-up (on this host) to reject any attempt to add a query string to its URLs.
I decided to be a little ornery and disallow any query strings to this web server. This shouldn't break anything, but it does. There is to be no additional arguments or parameters sent to the content on this web host, but some people seem to think otherwise.
They're wrong, of course.