TWITTER - Key Persons

Job Titles:

• Member of the Compensation Committee
• Member of Our Board of Directors
• Member of the Audit Committee / Member of the Compensation Committee
• President and Chief Product Officer, Salesforce

Bret Taylor has served as a member of our board of directors since July 2016. He is currently the President and Chief Product Officer at Salesforce. Previously, he served as CEO and co-founder of Quip (https://quip.com/) the modern productivity suite that simplifies your life and helps your team get work done faster. Prior to that, Bret was the Chief Technology Officer of Facebook, after it acquired FriendFeed, the social network he co-founded in 2007. Bret also worked as a Group Product Manager at Google, where he co-created Google Maps and started Google's Developer product group. Bret has an MS and a BS in Computer Science from Stanford. He is @btaylor on Twitter. Member of the Compensation Committee

Job Titles:

• Chairman of the Compensation Committee
• Member of the Nominating and Governance Committee
• CEO, 1stdibs.Com, Inc.
• Member of Our Board of Directors

Mr. Rosenblatt has served as a member of our board of directors since December 2010. Since November 2011, Mr. Rosenblatt has served as Chief Executive Officer of 1stdibs.com, Inc., an online luxury marketplace. From October 2008 to May 2009, Mr. Rosenblatt served as President of Global Display Advertising at Google. Mr. Rosenblatt joined Google in March 2008 in connection with Google's acquisition of DoubleClick, Inc., a provider of digital marketing technology and services. Mr. Rosenblatt joined DoubleClick in 1997 as part of its initial management team and served in several executive positions during his tenure, including as Chief Executive Officer from July 2005 to March 2008 and President from 2000 to July 2005. Mr. Rosenblatt currently serves on the boards of directors of IAC/InterActiveCorp, a media and Internet company, and a number of privately held companies. Mr. Rosenblatt holds a B.A. in East Asian Studies from Yale University and an M.B.A. from Stanford University. Mr. Rosenblatt was selected to serve on our board of directors because of his operating and management experience with a range of Internet and technology companies, particularly his experience with companies that focused on monetizing large online audiences. Chair of the Compensation Committee Member of the Nominating and Governance Committee

Job Titles:

• Chairman of the Nominating and Governance Committee
• Chairman and Chief Executive Officer, BET Networks
• Member of Our Board of Directors
• Member of the Audit Committee / Member of the Nominating and Governance Committee

Debra L. Lee has served as a member of our board of directors since May 2016. She is Chairman and Chief Executive Officer of BET Networks, a media and entertainment subsidiary of Viacom, Inc. She joined BET in 1986 and served in a number of executive positions before becoming Chairman and Chief Executive Officer in January 2006, including President and Chief Executive Officer from June 2005 to January 2006, President and Chief Operating Officer from 1995 to 2005, and also served as Executive Vice President and General Counsel, and Vice President and General Counsel. Ms. Lee serves on the board of directors of Marriott International, Inc. and WGL Holdings, Inc., an energy company. She also serves on the board of a number of professional and civic organizations, including as Immediate Past Chair of the Advertising Council, as the President of the Alvin Ailey Dance Theater, and as a Trustee Emeritus at Brown University. Ms. Lee holds a B.A. from Brown University, a J.D. from Harvard Law School and an M.P.P. from Kennedy School of Government at Harvard University.

Job Titles:

• Member of the Compensation Committee
• CEO, Medium CEO, Obvious Corp

Mr. Williams is one of our founders and has served as a member of our board of directors since May 2007. From October 2008 to October 2010, Mr. Williams served as our President and Chief Executive Officer, from July 2009 to March 2010, as our Chief Financial Officer and from February 2008 to October 2008, as our Chief Product Officer. Since April 2011, Mr. Williams has served as Chief Executive Officer of Medium, an online publishing platform, and since October 2006, as Chief Executive Officer of The Obvious Corporation, a technology systems innovator. Mr. Williams was selected to serve on our board of directors because of the perspective and experience he brings as one of our founders and as one of our largest stockholders, as well as his extensive experience with technology companies.

Job Titles:

• CEO
• Chairman
• CEO and Co - Founder, Twitter CEO, Square

Jack is the CEO of Twitter, CEO & Chairman of Square, and a co-founder of both. He also serves on the Board of The Walt Disney Company.

Job Titles:

• Member of the Audit Committee
• Member of the Compensation Committee
• Chairman of the Compensation Committee Member of the Nominating and Governance Committee
• Chairman, MacArthur Foundation

Ms. Scardino served as Chief Executive Officer and as a member of the board of directors of Pearson PLC, a publishing and education company, from 1997 to 2012. From 1985 to 1997, Ms. Scardino served in several roles at The Economist Group, a media company, including as Chief Executive Officer. Ms. Scardino served on the board of directors of Nokia Corporation, a telecommunications company, from 2001 to April 2013. Ms. Scardino holds a B.A. in Psychology from Baylor University and a J.D. from the University of San Francisco School of Law. Ms. Scardino was selected to serve on our board of directors because of the strength of her extensive knowledge of the media industry and her global business experience. Member of the Audit Committee Member of the Compensation Committee

Job Titles:

• Member of the Audit Committee
• Member of the Nominating and Governance Committee
• Founder and Chairperson, Doteveryone.Org.Uk Chairperson, MakieLab Crossbench Peer in House of Lords
• Member of Our Board of Directors

Martha Lane Fox has served as a member of our board of directors since April 2016. From 1998 to 2003, Ms. Lane Fox was the co-founder and managing director of lastminute.com, a travel and leisure website, and remained on the board of directors until 2005. Since August 2005, Ms. Lane Fox has served as the founder and chairperson of Lucky Voice, a private karaoke company, and since September 2012 as the chairperson of MakieLab, a 3D printing and game company. Since March 2013, Ms. Lane Fox has served as a crossbench peer in the United Kingdom House of Lords. Since September 2015, Ms. Lane Fox has served as the founder and chairperson of doteveryone.org.uk, an organization advancing the understanding and use of Internet enabled technologies, and in September 2014 was appointed Chancellor of Open University. From July 2007 to April 2015, Ms. Lane Fox served on the board of directors of Marks & Spencer, a retail company, and has served on various private company boards. Ms. Lane Fox holds a B.A. in Ancient History and Modern History from the University of Oxford. Member of the Audit Committee Member of the Nominating and Governance Committee

Job Titles:

• Chairman of the Nominating and Governance Committee
• Senior Adviser, Lazard
• Senior Advisor to Lazard, Ltd

Dr. Okonjo-Iweala has served as a Senior Advisor to Lazard, Ltd., a global financial advisory and asset management firm, since September 2015. Prior to joining Lazard, she served as the Minister of Finance of Nigeria from July 2003 until June 2006 and as the Minister of Finance and Coordinating Minister for the Economy of Nigeria from August 2011 until May 2015. From 1982 until 2003 and then from December 2007 until August 2011, she held several positions at the World Bank, most recently as Managing Director from December 2007 until August 2011. She has been a member of the Board of Directors of Standard Chartered plc, a multinational banking and financial services company, since November 2017. Dr. Okonjo-Iweala has served as the Board Chair of the Global Alliance for Vaccines and Immunization (GAVI) since January 2016. Dr. Okonjo-Iweala holds a Ph.D. from the Massachusetts Institute of Technology and an A.B. from Harvard University.

Job Titles:

• Executive Chairman
• Nominating and Governance

As Executive Chairman of Twitter, Omid is responsible for providing leadership and support for the executive team, as well as recruiting key talent. Previously, he served as Senior Vice President and Chief Business Officer for Google Inc., from August 2014 to August 2015; prior to that, he served as Google's Senior Vice President of Global Sales and Business Development for ten years. Omid started his career in Silicon Valley as a product marketing manager at HP, followed by a series of start-up experiences at early smartphone innovator GO Corporation and interactive gaming company 3DO. In 1995 he became an early employee at Netscape and went on to lead Netscape's sales and business development organization as vice president. Omid holds a BS in Electrical Engineering from San Jose State University, where he has endowed an Engineering Chair, and an MBA from Stanford University, where he served on the Graduate School of Business Advisory Board. He is @omidkordestani on Twitter.

Job Titles:

• Chairman of the Audit Committee
• Board Member, Bombardier Inc

Mr. Pichette served as Senior Vice President and Chief Financial Officer of Google Inc. from August 2008 until May 2015. Prior to joining Google, from January 2001 until July 2008, Mr. Pichette served as an executive officer of Bell Canada Enterprises Inc., including, in his last position, as President, Operations for Bell Canada, and previously as Executive Vice President, Chief Financial Officer, and Executive Vice President of Planning and Performance Management. Prior to joining Bell Canada Enterprises, from 1996 to 2000, Mr. Pichette was a principal at McKinsey & Company. Prior to that, from 1994 to 1996, he served as Vice President and Chief Financial Officer of Call-Net Enterprises Inc., a Canadian telecommunications company. Mr. Pichette has been a member of the board of directors of Bombardier Inc., a manufacturer of airplanes and trains, since October 2013, and serves on its audit committee and human resources and compensation committee. Mr. Pichette was previously a director of Amyris, Inc., a renewable products company, from March 2010 to May 2013. Mr. Pichette holds a Master of Arts degree in philosophy, politics, and economics from Oxford University, where he attended as a Rhodes Scholar, and a Bachelor of Arts degree in Business Administration from Université du Québec à Montréal. Chair of the Audit Committee

Job Titles:

• Chairman of the Board of Directors of AllianceBernstein Holding L.P
• Chairman, AllianceBernstein Holding

Mr. Zoellick has served as the Chairman of the board of directors of AllianceBernstein Holding L.P., a global investment management firm, since April 2017. Mr. Zoellick has also served as a board member of Temasek Holdings (Private) Ltd., a Singaporean corporation principally engaged in the business of investment holding, since August 2013. He has served as a Senior Counselor to the Brunswick Group, a global public affairs and communications firms, since May 2017. Since July 2012, he has also been a Senior Fellow at the Belfer Center for Science and International Affairs at Harvard University's Kennedy School of Government. From October 2013 until September 2016, he served as Chairman of the Board of International Advisors at the Goldman Sachs Group. From July 2007 until June 2012, Mr. Zoellick served as President of the World Bank Group. From 2006 to 2007, Mr. Zoellick served as vice chairman, international and a managing director of Goldman Sachs. Mr. Zoellick served as the Deputy Secretary for the U.S. Department of State from 2005 until 2006 and as the U.S. Trade Representative from 2001 to 2005. From 1985 to 1993, Mr. Zoellick held various posts in the U.S. government, including Counselor to the U.S. Secretary of the Treasury, Under Secretary of State, and Deputy Chief of Staff at the White House. Mr. Zoellick holds a J.D. from the Harvard Law School, an M.P.P. from Harvard's Kennedy School of Government, and a B.A. from Swarthmore College.