The preparation of condensed consolidated financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, we evaluate our estimates, including those related to provisions for transaction losses, legal contingencies，income taxes, revenue recognition， stock-based compensation， investments， goodwill and therecoverability of intangible assets. We base our estimates on historical experience and on various other assumptionsthat we believe to be reasonable under the circumstances. Actual results could differ from those estimates.