Twitter is an online social networking platform, launched in 2006. In several years since its release, the service has become a success, as by 2012 Twitter already had over 100 million users from all over the world. Just one year later, the social network was named one of the most visited websites according to Alexa Internet. Available for use on most technology platforms, Twitter enables users to communicate through short 140-character long messages and is often considered a provider of breaking news. The head office is located in San Francisco. Twitter shares are traded on the New York Stock Exchange.