Add a FAQ explaining what it means when a USERNAME that IS an e-mail address, appears on a Web site that you have never used.
There is a FAQ explaining that a non-email userid can appear as a breach from a site that you have never used, because of collisions (others reusing the same e-mail address). I have an e-mail address that I have used for 20 years, which shows up in the MYSPACE and also the BITTORRENT FORUM breaches. I have never used either of these sites. A FAQ saying how this is possible would be welcomed.
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David Walker
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Great suggestion! Done: https://haveibeenpwned.com/FAQs#UnknownService