Twitter has 284 million monthly active users who send 500 million tweets per day. 80% of active Twitter users access the platform on mobile devices. Twitter allows users to create free accounts to connect with others worldwide by sending tweets, which are limited to 140 characters. Tweets can be shared through retweets and likes by followers. The platform targets all ages and includes features like hashtags, direct messages, and trending topics. With over 3,600 employees, half of whom are engineers, Twitter is headquartered in San Francisco and was incorporated in 2007.