14.9M accounts from 500px (500px.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesGendersGeographic locationsNamesPasswordsUsernames
In mid-2018, the online photography community 500px suffered a data breach. The incident exposed almost 15 million unique email addresses alongside names, usernames, genders, dates of birth and either an MD5 or bcrypt password hash. In 2019, the data appeared listed for sale on a dark web marketplace (along with several other large breaches) and subsequently began circulating more broadly.
Source: Have I Been Pwned (CC BY 4.0)