Only time shortened urls are appropriate is when you cannot hyperlink text, and have a list, but that's not the case here, you can hyperlink text, and so the editor is a WYSIWYG editor, so no reason not to just link the full original links.
And when shortened links are approriate, such as on YouTube descriptions, only use trustworthy shortners. I always use Google's on YouTube for obvious reasons because Google. But again, on a forum/website/blog in general that you can hyperlink text, it's unneeded.