In May 2016, 
LinkedIn had 164 million email addresses and passwords exposed. Originally hacked in 2012, the data remained out of sight until being offered for sale on a dark market site 4 years later. The passwords in the breach were stored as SHA1 hashes without salt, the vast majority of which were quickly cracked in the days following the release of the data.
                    
            
    
    
        
            
            
                
            
            
                
                                            - Date: May 5, 2012
                        
- Domain:
                                                            
                                    linkedin.com
                                
                                                    
- Category: Social Media & Communication
- Records Announced: 164,611,595
                        
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                                                            Sources:
                                
                                                    
 
         
     
    
    
        
            
            
                
            
            
                
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                        Data:
                                                                                    
                                
                                                                            
                                                                        Email Addresses
                                
                                                            
                                
                                                                            
                                                                        Passwords
                                
                                                                        
 
         
     
    
    
        
            
            
                
            
            
                
                                            - Imported:
                                                            
                                                    
- Records Imported: 201,222,567
- Number of lines: 250,758,057
- Size: 10.58 GB
- Passwords:
                                                    SHA-1
                                            
- Cracked:
                                                            96%
                                                    
 
         
     
 
         
        
                                    
            
                            
    
        Fields count statistics
    
    
        Numbers may not be precise, a precision threshold of 100 is used to determine if a field is unique.
    
 
    
        
                                            
                
                    password.plain top values
                
                
                    
                        
                    
                
             
                                            
             
        
        Only the top 100 values are displayed in the chart.
        Values with less than 100 occurrences are not displayed.