By default many URL Filtering products will block the navigation of short URLs (e.g. the URL used by Twitter to link external pages).
What is the reason behind this block? Why I should prevent the navigation of short url?
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Usually a user can inspect the link on a website before clicking it. Certain websites serve the lone purpose of redirecting to another URL, which cannot be checked easily beforehand. Therefore, the user cannot possible know, which website he is about to connect to, which is not really safe-browsing.
I guess, this is the most common reason to block Short-Links.