A technique used by hackers is hiding a malicious URL using a URL shortening service like Goo.gl, TinyURL or the automatic shortening done by twitter using the t.co address. There are plug-ins for most browsers that show the actual URL however you may not want to install another browser plug-in (that may compromise your security or slow down the browser).
LongURL performs this function without having to install anything.
1. GO to LONGURL
2. Enter your short URL
You immediately get the title, short URL, how many redirects they have seen to that address and the long URL. I tried the service with about a dozen different shortened URLs (from different providers and to different web sites) and screenshot never seemed to appear.