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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities |  |  |
Net loss | $ (919,488) | $ (532,607) | $ (282,308)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 211,576 | 64,567 | 42,974
Common stock charitable donation expense | 0 | 0 | 63,615
Stock-based compensation expense | 550,065 | 347,159 | 134,629
Other | 21,418 | 13,843 | 3,246
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable, net | (9,548) | (65,151) | (63,294)
Prepaid expenses and other | (21,719) | (22,014) | (22,116)
Other assets | 40,096 | 5,157 | 16,351
Accounts payable | (17,574) | 2,022 | (2,526)
Accrued expenses and other | (1,041) | 31,767 | 94,639
Publisher payables | (50,242) | 55,368 | 44,605
Other long-term liabilities | (29,790) | (27,313) | (47,310)
Deferred revenue | 166,816 | 15,753 | 37,408
Net cash used in operating activities | (59,431) | (111,449) | 19,913
Investing activities |  |  |
Purchases of short-term investments | (150,911) | (519,698) | (482,453)
Proceeds from sales of short-term investments | 436,293 | 0 | 0
Proceeds from principal repayments and maturities of short-term investments | 387,453 | 308,957 | 1,644
Purchases of non-marketable investments | (15,000) | (4,600) | (1,000)
Sales of non-marketable investments | 1,000 | 0 | 0
Purchases of property and equipment | (57,138) | (41,938) | (40,156)
Acquisition of intangible assets | 0 | 0 | (750)
Business acquisitions, net of cash acquired | 121,531 | (1,580,081) | (52,475)
Net cash provided by (used in) investing activities | 723,228 | (1,837,360) | (575,190)
Financing activities |  |  |
Proceeds from issuance of convertible notes | 1,000,000 | 1,725,000 | 0
Purchase of capped calls | 0 | (48,127) | 0
Proceeds from revolving loan facility | 0 | 0 | 125,000
Payment of principal related to revolving loan facility | 0 | 0 | (125,000)
Payment of debt issuance costs | (379) | (22,575) | (247)
Capital contribution from noncontrolling interest holders | 210,252 | 0 | 0
Proceeds from initial public offering, net of underwriting discounts, commissions, and offering costs | 0 | 0 | 1,417,582
Proceeds from issuance of convertible preferred stock, net of issuance costs | 0 | 0 | 149,970
Proceeds from issuance of common stock | 0 | 0 | 100,000
Repurchase and retirement of common stock | (1,500,000) | 0 | (110)
Proceeds from issuance of common stock from employee equity plans | 63,493 | 66,704 | 34,260
Net cash (used in) provided by financing activities | (226,634) | 1,721,002 | 1,701,455
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | 1,926 | 459 | 673
Increase (decrease) in cash, cash equivalents, and restricted cash | 439,089 | (227,348) | 1,146,851
Cash and restricted cash, beginning of period | 1,066,599 | 1,293,947 | 147,096
Cash, cash equivalents, and restricted cash, end of period | 1,505,688 | 1,066,599 | 1,293,947
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 0 | 110 | 1,393
Cash paid for income taxes, net of refunds | 25,206 | 5,651 | 19,956
Cash paid for operating leases | 28,463 | 29,811 | 29,336
Supplemental disclosures of non‑cash investing and financing activities: |  |  |
Fair value of common stock issued as consideration for business and asset acquisitions | 2,932,296 | 526,081 | 25,380
Assets acquired under operating lease | $ 20,699 | $ 18,507 | $ 24,647

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