By Tara John
167 MILLION
Estimated number of users affected by a 2012 hack that was originally thought to have exposed only 6.5 million passwords; the true total was revealed in May when hackers tried to sell more passwords online
HEARTLAND
130 MILLION
Estimated number of credit and debit cards compromised after the card-payment processor was hacked in 2008; the breach cost the firm at least $140 million in settlements with credit-card companies
DROPBOX
68 MILLION
Estimated number of user names and passwords stolen from the cloud-storage company as part of a 2012 hack, though the scope of the breach did not become fully clear until this August
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