Twitter is a social media platform that allows users to post short messages called tweets. It was created by Jack Dorsey in 2006 and gained popularity with over 200 million users by 2011. While known for celebrity tweets, Twitter is also used widely for business, sports, news, government, and other purposes. An analysis of tweets found that 40% were pointless babble, 38% were conversational, and the remaining types were pass-along value, self-promotion, spam, and news. Teachers can use Twitter for class discussions, tracking topics, providing feedback, and having students follow experts in relevant fields.