Users tend to reuse passwords to make their life simple. This includes reusing the same passwords across multiple sites and using the same passwords for years and years.
This is bad of course. We see it in the news so frequently that no one is surprised that millions of accounts are compromised at companies every week. What happens to this compromised data? Very often it is dumped online where anyone can see it. In fact, a vast collection of compromised information from usernames and passwords to addresses to employment histories and more is or has been available online related to all of these compromised web accounts.
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