Twitter is a social media platform that allows users to share short messages called tweets. It is considered a web 2.0 application because its value comes from user-generated content rather than software. To create an account, users visit the Twitter website and fill out sign up information. They can then follow other users, post tweets with hashtags, photos, or locations, and like or share other users' tweets. In education, Twitter can be used to involve students in expressing opinions, following educators and other students, and participating in virtual classroom discussions and collaborations.