Twitter On Screen

Twitter is a online social networking and micro-blogging service. It's key feature is the limit of tweets to 140 characters promoting fast and live conversations. It introduced the #hastag to the online world; used to indicate subjects and link conversations, it has since spread to all the major social networks.

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Bob Diamond At Davos

Ex-Barclays chief Diamond sends first tweet

More than three months after joining the microblogging site, Bob Diamond, the former chief executive of Barclays, has sent his first tweet, congratulating his daughter Nell on her wedding this weekend

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