Know URL is a usefull website which can able to check whether “Short URL” link of twitter tweets is Harmfull [or] Safe to click.
There are many websites to create short URL, where you can able to create short URL from the original link of a website or a link, so that it is very helpfull while tweeting in Twitter.
Do read – How to create Looongest URL ?

But some spammers mis-use this service for their profit, they create a Short Url of a malware site and they spread this via Tweets. When you tend to click that link, you may redirect to a Malware site which is highly dangerous to your computer.
BY using “Know URL” service you can check whether the short URL link is fake or Real and also helps you to safeguard your computer from Malware and Phishing attack.
Just copy paste the short URL link in the box & click “show URL” button

You can check whether the link is Virus free by clicking “Virus scan link”.
If you click the “virus scan link” you will be re-directed to “Google site diagnosis”, there you can able to know whether the link is Harmfull or safe for Browsing.
Mobile version of this Service – m.knowurl.com
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Useful. Also, there's this Add-on that expands URLs https://addons.mozilla.org/en-US/firefox/addon/58…
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wow…cool….
thanks Hari for the useful link
At last i got some short link tracker like this to check a harmful link… Thanks for the information!
I was really tensed about this subject but anyway now solved….
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Hey Sudharsan, similar type of service is Sucuri, and also a Firefox plugin works quiet well. See this post :- http://www.avitricks.info/2010/06/whats-inside-sh…
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wow….cool
but this post is a “frndly post”….