16.7M accounts from Fotolog (fotolog.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In December 2018, the photo sharing social network Fotolog suffered a data breach that exposed 16.7 million unique email addresses. The data also included usernames and unsalted SHA-256 password hashes. The site was dissolved the following year and repurposed as a news website based in Brcko, Bosnia and Herzegovina.
Source: Have I Been Pwned (CC BY 4.0)