Transactions Table

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Explanation of Responses:

Id	Content
F1	The Issuer's Class B Common Stock is convertible into the Issuer's Class A Common Stock on a one-for-one basis at the election of the holder thereof and has no expiration date. In addition, upon any transfer of shares of Class B Common Stock, each such transferred share will automatically convert into one share of Class A Common Stock, except for certain "Permitted Transfers" described in the Issuer's certificate of incorporation.
F2	The Reporting Person is a director and stockholder of SC US (TTGP), Ltd. SC US (TTGP), Ltd. is (i) the general partner of SC U.S. Growth VIII Management, L.P. ("GFVIII Management"), which is the general partner of Sequoia Capital U.S. Growth Fund VIII, L.P. (GFVIII), (ii) the general partner of SC U.S. Venture 2010 Management, L.P. ("USV2010 Management"), which is the general partner of Sequoia Capital U.S. Venture 2010-Seed Fund, L.P. (USV 2010-Seed), and (iii) the general partner of SC U.S. Growth IX Management, L.P. ("GFIX Management"), which is the general partner of Sequoia Capital U.S. Growth Fund IX, L.P., Sequoia Capital U.S. Growth Partners Fund IX, L.P., and Sequoia Capital U.S. Growth IX Principals Fund, L.P. (collectively "the GFIX Funds").
F3	(Continued from Footnote 2) The Reporting Person disclaims beneficial ownership of the shares held by GFVIII, USV 2010-Seed, and the GFIX Funds except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
F4	The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.80 to $10.33. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above.
F5	The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.00 to $10.49. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above.
F6	The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $10.00 to $10.22. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above.
F7	The Reporting Person is a member of Sequoia Grove Manager, LLC. The Reporting Person disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.