there are many short links available if you use twitter, the most use url shortener is bit.ly but sometime you need to make sure that the links you clicks are really the links that you are intend to visit and not a site that can install any malware or fraudulent site that can send misinformation. To do this precaution though there are now firefox addon that can do this. this addon names is verify redirect and it will ask for your confirmation to open the link or just close it while showing you the actual link of that short url. you can download the addon here
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