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Every Yahoo account that existed—all 3 billion—was compromised in 2013 hack | Ars Technica

arstechnica.com/information-technology/2017/10/yahoo-says-all-3-billion-accounts-were-compromised-in-2013-hack

What Jamie wrote

Yahoo said a major security breach in 2013 compromised all three billion accounts the company maintained, a three-fold increase over the estimate it disclosed previously.

This has to be the largest breach in history. Wow.