Bookmark this for your friends who join the Twittersphere: How to Use Twitter

Different social media have different uses, strengths, and advantages. Twitter[1] could be called a 'real time social networking' site, a place for sharing information as it happens and for connecting with others in real time, often making lasting friendships and contacts.
Learning how to use this fun, free, and useful tool can be a bit intimidating for the beginner, but don't be put off ? with a little effort and a lot of innate feeling your way through, being able to use Twitter well can make you 'digitally' famous!

Source: http://www.wikihow.com/Use-Twitter

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