Shereen's definition of Twitter
Twitter is an online social networking and microblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters.
Registered users can read and post tweets but unregistered users can only read them.
Twitter was created in March 2006 by Jack Dorsey and the site was launched by July 2006.
Twitter is one of the ten most visited websites and has been described as the SMS of the Internet.
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