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Some users believe that the preview feature of other URL Redirection service can keep them safe. That is true

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if the user is aware what is safe or trusted or not. How many times we’ve seen reports in forums that users fall into clicking or proceeding to a link because they thought it’s safe? I’m sure you know the numbers but you don’t have the exact number simply because there are many. Users need visible notice to alert them whether the site, link or file is safe.
The example screenshot at the left is a using TinyURL URL shortener that has preview feature. As you can see, the link is going to be redirected to a site that is not known to viewer or user whether it’s safe or malicious. No security rating icon and the user or viewer of the page do not have no clue at all - whether they are safe if they will proceed. If a user will receive a non-preview link generated using TinyURL, they will end up downloading a malicious file (see the image at the right)