Last updated: 21 march, 2011 - 17:11 GMT
Twitter@5: Five years of 140-character social networking
It has been five years since Twitter was launched when one of its founders, Jack Dorsey, tweeted "just setting up my twttr'.
Since then the micro-blogging site has grown hugely in popularity - over 140 million tweets are published every day.
Mohamed Yehia from the BBC's Arabic Service discusses Twitter's success with Richard Coope, social media expert at the Radley Yelder communications company.
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First broadcast 21 March 2011
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