Twitter co-founder Biz Stone gestures as he poses for photographers at the start of the Twitter Conference LA in Los Angeles on September 22, 2009. Twitter, the micro-blogging platform which has attracted tens of millions of users but has yet to make money, has changed its terms to potentially open up the free service to advertisers. Twitter, which allows users to pepper one another with messages of 140 characters or less, has seen explosive growth since it launched publicly in August 2006 but has been unable so far to generate revenue. Getty Images logo Getty Images 29 months ago

Twitter co-founder Biz Stone gestures as he poses for photographers at the start of the Twitter Conference LA in Los Angeles on September 22, 2009. Twitter, the micro-blogging platform which has attracted tens of millions of users but has yet to make money, has changed its terms to potentially open up the free service to advertisers. Twitter, which allows users to pepper one another with messages of 140 characters or less, has seen explosive growth since it launched publicly in August 2006 but has been unable so far to generate revenue.

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