Twitter
Twitter, currently changing its name to X, is a social networking and microblogging service. Users use any device with an internet connection and a web browser to send and to read messages, called "tweets". For years, tweets could be up to 140 characters long, then doubled to 280 characters in November 2017. Tweets appear on the user's profile webpage. Tweets can usually be read by anyone, but senders can also keep messages private. Private tweets only go to their list of friends. Users may subscribe to tweets from other people. This is called following, and subscribers are known as followers. As of late 2009, users can also follow lists of authors.