Wouldn't this defeat the purpose of the tinyUrl in the first place,

I could see getting the original link back to parse as you wish, but the user is posting it as that is how they want it displayed ... to get link text you would need to parse the URL and get it from there (unless you have a WYSIWYG) that changes the link text ( this to would defeat the purpose of tinyURL parsing.. )
if the link has a list of parameters that are added to the query string in the HREF attribute they will still be weary of the link, especially if it is not a trusted site .... ?

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