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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2022
Mar. 31, 2021
Dec. 30, 2020
Aug. 31, 2015
Significant Accounting Policies [Line Items]              
Collateral amount $ 15,500,000       $ 15,500,000    
Impairment charges related to film costs 0 $ 0 $ 0        
Equity investment without a readily determinable fair value 3,600,000 2,300,000          
Increase in fair value of investment 1,300,000            
Impairment of long-lived assets   0 0        
Income tax benefit for stock- based compensation arrangements 0 0 $ 0        
Right-of-use assets 66,581,000 0          
Noncurrent lease liabilities $ 59,315,000 $ 0          
Accounting Standards Update 2016-02              
Significant Accounting Policies [Line Items]              
Right-of-use assets       $ 77,800,000      
Noncurrent lease liabilities       $ 96,000,000      
Minimum              
Significant Accounting Policies [Line Items]              
Useful life of enhancements 1 year            
Maximum              
Significant Accounting Policies [Line Items]              
Useful life of enhancements 3 years            
Accounts Receivable | Customer Concentration Risk | Customer 1              
Significant Accounting Policies [Line Items]              
Concentration risk, percentage 16.00% 11.00%          
Accounts Receivable | Customer Concentration Risk | Customer 2              
Significant Accounting Policies [Line Items]              
Concentration risk, percentage 13.00%            
Accounts Receivable | Customer Concentration Risk | Customer 3              
Significant Accounting Policies [Line Items]              
Concentration risk, percentage 10.00%            
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 1              
Significant Accounting Policies [Line Items]              
Concentration risk, percentage 11.00% 13.00% 13.00%        
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Customer 2              
Significant Accounting Policies [Line Items]              
Concentration risk, percentage 11.00% 12.00% 10.00%        
Revolving Credit Facility              
Significant Accounting Policies [Line Items]              
Maximum borrowing capacity           $ 50,000,000  
BuzzFeed Japan              
Significant Accounting Policies [Line Items]              
Ownership interest, parent (in percent)             51.00%
Ownership interest, noncontrolling owners (in percent) 49.00%            
BuzzFeed Japan | Z Holdings Corporation              
Significant Accounting Policies [Line Items]              
Ownership interest, noncontrolling owners (in percent)             21.50%
BuzzFeed Japan | Asahi Shimbun Company              
Significant Accounting Policies [Line Items]              
Ownership interest, noncontrolling owners (in percent)             24.50%
BuzzFeed Japan | ValueCommerce Co. Ltd.              
Significant Accounting Policies [Line Items]              
Ownership interest, noncontrolling owners (in percent)             3.00%