the-773-million-record-collection-1-data-reach 
Krebs on Security
MAY 19, 2020
In January 2019, dozens of media outlets raised the alarm about a new “megabreach” involving the release of some 773 million stolen usernames and passwords that was breathlessly labeled “the largest collection of stolen data in history.”
Troy Hunt
FEBRUARY 11, 2019
On reflecting over the last 3 and a half weeks, this is where we seem to be with credential stuffing lists today and I want to use this blog post to explain the thinking whilst also addressing specific questions I've had regarding Collections #2 through #5. them were unique (my own identical record appeared half a dozen times).
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