Explanation of Responses:
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1)
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The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
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2)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.26 to $117.25 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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3)
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Shares held of record by Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004.
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4)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $117.26 to $118.25 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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5)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.26 to $119.25 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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6)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.26 to $120.255 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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7)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.26 to $120.76 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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8)
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Represents the transfer of shares from Jan Koum, Trustee of The Jan Koum Trust I U/A/D 4/29/2014 to Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004. The reporting person remains the beneficial owner of all of the shares after the transfer.
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9)
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Shares held of record by Jan Koum, Trustee of The Jan Koum Trust I U/A/D 4/29/2014.
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10)
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On April 29, 2016, Jan Koum, Trustee of The Butterfly Trust U/A/D 1/20/2004 contributed 3,500,000 shares of Class A common stock to Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IX U/A/D 4/13/2016, a grantor retained annuity trust for the benefit of the reporting holder.
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11)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IX U/A/D 4/13/2016.
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12)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $116.61 to $117.605 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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13)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $117.61 to $118.605 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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14)
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The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.61 to $118.725 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
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15)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VIII U/A/D 1/29/2016.
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16)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust IV U/A/D 2/4/2015.
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17)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust V U/A/D 4/29/2015.
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18)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VI U/A/D 8/5/2015.
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19)
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Shares held of record by Jan Koum and BNY Mellon Trust of Delaware, Co-Trustees of The Jan Koum Trust VII U/A/D 10/20/2015.
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20)
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Shares held of record by Jan Koum, Trustee of The Jan Koum Trust II U/A/D 8/5/2014.
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21)
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Shares held of record by Jan Koum, Trustee of The Jan Koum Trust III U/A/D 10/9/2014.
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