49M accounts from Netlog (netlog.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In July 2018, the Belgian social networking site Netlog identified a data breach of their systems dating back to November 2012 (PDF). Although the service was discontinued in 2015, the data breach still impacted 49 million subscribers for whom email addresses and plain text passwords were exposed.
Source: Have I Been Pwned (CC BY 4.0)