This app is useful for URL Shortening. URL shortening is a technique on the World Wide Web in which a URL may be made substantially shorter in length and still direct to the required page. For example, the URL "http://en.wikipedia.org/wiki/URL_shortening" can be shortened to "http://bit.ly/urlwiki", "http://tinyurl.com/urlwiki", "http://is.gd/urlwiki" or "http://goo.gl/Gmzqv". This is especially convenient for messaging technologies such as Twitter and Identi.ca which severely limit the number of characters that may be used in a message.