Twitter is a social networking and microblogging service, owned and operated by Twitter Inc., that enables its users to send and read other users' messages called tweets. Tweets are text-based posts of up to 140 characters displayed on the author's profile page. Tweets are publicly visible by default, however senders can restrict message delivery to their friends list. Users may subscribe to other author tweets—this is known as following and subscribers are known as followers. As of late 2009, users can follow lists of authors instead of following individual authors.[7][8] All users can send and receive tweets via the Twitter website, compatible external applications (such as, for smartphones), or by Short Message Service (SMS) available in certain countries.[9] While the service is free, accessing it through SMS may incur phone service provider fees. The website is based out in San Bruno, California near San Francisco (where the website was first based). Twitter also has servers and offices in San Antonio, Texas and Boston, Massachusetts.
Since its creation in 2006 by Jack Dorsey, Twitter has gained notability and popularity worldwide and currently has more than 100 million users worldwide.[10] It is sometimes described as the "SMS of the Internet."[11] The use of Twitter's application programming interface (API) for sending and receiving SMS from other applications often dominates the direct use of Twitter.
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