Twitter is a microblogging tool that allows users to send short 140-character messages called tweets. It has become very popular with over 7 million users in 2009, including many teachers and students who use it to communicate. Twitter can be used for language teaching by having students follow each other and news organizations, read and write tweets, and collaborate on stories. It helps develop cultural awareness when interacting with native English speakers and supports active learning compared to traditional classrooms.