Twitter co-founder Biz Stone, left, and rapper Chamillionaire pose together at 140: The Twitter Conference LA in Los Angeles on Tuesday, Sept. 22, 2009. AP Photo logo AP Photo 2 months ago

Twitter co-founder Biz Stone, left, and rapper Chamillionaire pose together at 140: The Twitter Conference LA in Los Angeles on Tuesday, Sept. 22, 2009.

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  1. Twitter co-founder Biz Stone, left, and rapper Chamillionaire pose together at 140: The Twitter Conference LA in Los Angeles on Tuesday, Sept. 22, 2009.
  2. Twitter co-founder Biz Stone, right, and rapper Chamillionaire greet each other at 140: The Twitter Conference LA in Los Angeles on Tuesday, Sept. 22, 2009.
  3. 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.
  4. Twitter co-founder Biz Stone jokingly 'Tweets' 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.
  5. Twitter co-founder Biz Stone is interviewed during 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.
  6. Twitter co-founder Biz Stone 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.
  7. Biz Stone, co-founder of Twitter, Inc., is interviewed following his keynote speech at the 140: Twitter Conference LA in Los Angeles September 22, 2009.
  8. Biz Stone, co-founder of Twitter, Inc., is interviewed following his keynote speech at the 140: Twitter Conference LA in Los Angeles September 22, 2009.
  9. 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.
  10. Twitter co-founder Biz Stone jokingly 'Tweets' 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.
  11. Twitter co-founder Biz Stone is interviewed during 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.
  12. Twitter co-founder Biz Stone 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.
  13. Delegates at 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.
  14. Delegates at 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.
  15. Biz Stone, co-founder of Twitter, Inc., is interviewed following his keynote speech at the 140: Twitter Conference LA in Los Angeles September 22, 2009.
  16. Biz Stone, co-founder of Twitter, Inc., is interviewed following his keynote speech at the 140: Twitter Conference LA in Los Angeles September 22, 2009.

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