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Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 06, 2024 | Apr. 25, 2024 | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Feb. 21, 2024 USD ($) | Mar. 31, 2021 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  |  |  | $ 15,500,000 |  |  |  |  | $ 15,500,000
Letters of credit outstanding, amount |  |  |  | $ 0 | $ 15,500,000 |  |  | $ 15,500,000 |
Film, Monetized on Its Own, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Cost of revenue, excluding depreciation and amortization | Cost of revenue, excluding depreciation and amortization | Cost of revenue, excluding depreciation and amortization |  |  |
Amortized film costs |  |  |  | $ 100,000 | $ 3,200,000 | $ 8,400,000 |  |  |
Impairment charges related to film costs |  |  |  | 0 | 0 | 0 |  |  |
Decrease in film costs |  |  |  | 0 | 700,000 |  |  |  |
Production tax credit receivable |  |  |  | 1,300,000 | 3,500,000 |  |  |  |
Equity investment without a readily determinable fair value |  |  |  | 800,000 | 800,000 | 3,600,000 |  |  |
Impairment of long-lived assets |  |  |  | 0 | 0 |  |  |  |
Income tax benefit for stock- based compensation arrangements |  |  |  | $ 0 | 0 | $ 0 |  |  |
Investment From Recapitalization Transaction |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, acquired during period |  |  |  |  | 0 |  |  |  |
Investment From Exchange Of Receivable |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, acquired during period |  |  |  |  | $ 800,000 |  |  |  |
Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock spilt ratio | 0.25 |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock spilt ratio | 0.25 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  | 6 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  |  |  | 500 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Useful life of enhancements (in years) |  |  |  | 1 year |  |  |  |  |
Minimum | Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Proposed stock split, conversion ratio |  | 0.5 |  |  |  |  |  |  |
Minimum | Class B Common Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Proposed stock split, conversion ratio |  | 0.5 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Useful life of enhancements (in years) |  |  |  | 3 years |  |  |  |  |
Maximum | Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Proposed stock split, conversion ratio |  | 0.04 |  |  |  |  |  |  |
Maximum | Class B Common Stock |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Proposed stock split, conversion ratio |  | 0.04 |  |  |  |  |  |  |
Accounts Receivable | Customer Concentration Risk | Customer 1 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as percent) |  |  |  | 26.00% | 13.00% |  |  |  |
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 1 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as percent) |  |  |  | 30.00% | 20.00% | 14.00% |  |  |
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 2 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as percent) |  |  |  |  | 11.00% | 11.00% |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  |  |  |  |  |  | $ 17,100,000 | $ 17,100,000 |
Repayments of long-term debt |  |  | $ 15,500,000 |  |  |  |  |  |
BuzzFeed Japan |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  | 52.60% |  |  |  |  |
BuzzFeed Japan | Minority Interest Partner |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, noncontrolling owners (as percent) |  |  |  | 3.00% |  |  |  |  |
BuzzFeed Japan | Z Holdings Corporation |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, noncontrolling owners (as percent) |  |  |  | 22.10% |  |  |  |  |
BuzzFeed Japan | Asahi Shimbun Company |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, noncontrolling owners (as percent) |  |  |  | 25.30% |  |  |  |  |

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