Big Data Breaches

LINKEDIN

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