There are two links in Ask Ubuntu contact page.
The first one is for contacting Ubuntu: http://www.ubuntu.com/about/contact-us (HTTP 😶)
The second one is for contacting Canonical: http://www.canonical.com/services/contact-us (HTTP 😶)
This redirects to https://ubuntu.com/support/contact-us. I feel that the redirected site is a bit irrelevant to contacting Canonical. I feel the link needs to be changed to this: https://canonical.com/contact-us