A simple URL shortener.
bit.ly is a URL Shortening service. It is incredibly popular on the web, especially on Twitter, where it is the default shortening service when posting. Its use has grown to the point where multiple competing URL shortening services have been forced to shut down. bit.ly also offers a fee-based custom short URL service.
bit.ly became the official URL shortener of Twitter on May 6, 2009.
Considered the most popular URL shortener on the web and one of the most popular sites in the world.
During the 2011 Libyan revolution, some .ly sites were in jeopardy and bit.ly lost considerable userbase due to fears that the service would become unstable.