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Researcher uncovers one of the biggest password dumps in recent history
(arstechnica.com)
This is a most excellent place for technology news and articles.
A password manager is irrelevant for Have I Been Owned, since the site only matches emails, not passwords. Also, that site includes mega lists which mix and match data from different services as well as spam lists... Not terribly useful.
PM's and avoiding reuse are still vital despite that.
It does match passwords https://haveibeenpwned.com/Passwords