1.05M accounts from StoryBird (storybird.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswordsUsernames
In August 2015, the storytelling service StoryBird suffered a data breach exposing 4 million records with 1 million unique email addresses. Impacted data also included names, usernames and passwords stored as PBKDF2 hashes. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)