28M accounts from Taringa (taringa.net) 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 September 2017, news broke that Taringa had suffered a data breach exposing 28 million records. Known as "The Latin American Reddit", Taringa's breach disclosure notice indicated the incident dated back to August that year. The exposed data included usernames, email addresses and weak MD5 hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)