Twitter founder Biz Stone (L) listens as San Francisco Mayor Gavin Newsom talks during a news conference in San Francisco, California June 1, 2009. Newsom announced a civic collaboration between the social networking service and the city's 311 customer service center, where citizens can now alert officials to issues by using Twitter. Reuters Pictures 5 months ago

Twitter founder Biz Stone (L) listens as San Francisco Mayor Gavin Newsom talks during a news conference in San Francisco, California June 1, 2009. Newsom announced a civic collaboration between the social networking service and the city's 311 customer service center, where citizens can now alert officials to issues by using Twitter.

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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. California Governor Arnold Schwarzenegger (L) participates in a moderated question and answer session with Twitter co-founders Biz Stone (C) and Evan Williams in San Francisco, California August 26, 2009, in this photograph released by Schwarzenegger's office. They discussed the social networking site as a public service engine that allows people to reach one another.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. San Francisco Mayor Gavin Newsom waves to the crowd at the closing ceremonies for the Presidents Cup golf tournament at Harding Park golf course in San Francisco, California, in this October 11, 2009 file photo. In a statement from his campaign office, Newsom withdrew from the 2010 California Governors race.
  14. SAN FRANCISCO - OCTOBER 27: Charles Schwab Corp. founder and chairman Chuck Schwab (L) jokes with San Francisco mayor Gavin Newsom (C) and John Fisher (R) during the grand opening of the new Charles Schwab flagship branch October 27, 2009 in San Francisco, California. Charles Schwab's new 12,500 square foot flagship location will offer space for customers to work with financial consultants, check on accounts and attend workshops.
  15. SAN FRANCISCO - OCTOBER 27: Charles Schwab Corp. founder and chairman Chuck Schwab (L) talks with San Francisco mayor Gavin Newsom during the grand opening of the new Charles Schwab flagship branch October 27, 2009 in San Francisco, California. Charles Schwab's new 12,500 square foot flagship location will offer space for customers to work with financial consultants, check on accounts and attend workshops.
  16. SAN FRANCISCO - OCTOBER 27: Charles Schwab Corp. founder and chairman Chuck Schwab (R) talks with San Francisco mayor Gavin Newsom (C) and Carrie Schwab Pomerantz (L) during the grand opening of the new Charles Schwab flagship branch October 27, 2009 in San Francisco, California. Charles Schwab's new 12,500 square foot flagship location will offer space for customers to work with financial consultants, check on accounts and attend workshops.

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