Disq.us is used to leave comments on posts at theChive.com. Never had a problem with it. Some of the material on theChive is a little racy but there is no nudity. It is designed for Twenty somethings on up.
Disqus is forcing this "shortener" on all links embedded in Disqus comments.
It not only allows surveillance through VigLink, but also breaks the "Open WOT scorecard" feature of the WOT Add-on, making it difficult to impossible to check a link before clicking.