Twitter is a social networking service that allows members to inform each other about what they are doing and what they think. It allows users to send messages via phone or instant messaging. Two SMS gateway numbers are available - one for USA, and one UK number for international use. Users can receive updates from other selected users via web, IM, or SMS. It made its debut at South by Southwest (SXSW) Interactive in March 2005. Its an example of a Micro-Blogging platform. Twitter lends itself well to haiku; a haiku written in Twitter is a twaiku.

Go to Twitter

Source : Wikipedia