Twitter has given rise to a lot of URL shortening services, which take the long URLs as input and shorten it with a 301 redirection which is Search Engine friendly. Thus, after visiting the Short URL we land up on the original page with the Long URL. Even though this services help to decrease the length of the URL, there are a few mishaps which may take place.
If a long URL of a web page containing malicious content is shortened, then people might not know the exact landing page where they may reach after clicking on the Short URL. This might cause problems and misuse of these URL shortening services.
So, it is actually necessary to check the Long URLs of the the Shortened ones before visiting them even though most of us find it time consuming to do so. So, I will tell you three services which will help you do this very fast!
Untiny is a service which provides various Add-Ons and Bookmarklets to help you reveal or extract the long URL from the short one. Its extremely easy to use and you just need to paste the short URL and click extract. The long URL behind it is revealed and you can visit is just by clicking on it.
Preview URL is an online utility which helps you get the Long URL along with the thumbnail of the Landing page. So, you get the rough idea about what the page will actually contain. If the page appears fishy, you may avoid visiting it.
Real-URL is a similar utility, which also shows the Most recently shared Pics with short URL and also the Most shared videos on Twitter and YouTube.