Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets".
Users can subscribe to the tweets of other users - this is called "forward" and subscribers are called "followers" or tweeps. By default, messages are public and can only spread showing them privately to supporters. Users can tweet from the web service from official external applications (such as for smartphones), or by Short Message Service (SMS) available in some countries.
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