Ans: Not at all. Shortened URLs are just short version of long URLs, they don't affect anything bad to your site.
Short Urls does not affect anything. It just makes the long url cut short. Here is the long list of free url shorteners http://www.techmaish.com/list-of-230-free-url-shorteners-services/
The only thing that short urls can affect - is a SEO, because you cannot use keywords in short urls which you can use in long urls.
hi., shortening URL's mean its a 301 permanent redirection which is userfriendly according to GOOGLE GUIDELINES.., it doesn't have any effects..,