1.25M accounts from Gawker (gawker.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 2010, Gawker was attacked by the hacker collective "Gnosis" in retaliation for what was reported to be a feud between Gawker and 4Chan. Information about Gawkers 1.3M users was published along with the data from Gawker's other web presences including Gizmodo and Lifehacker. Due to the prevalence of password reuse, many victims of the breach then had their Twitter accounts compromised to send Acai berry spam.
Source: Have I Been Pwned (CC BY 4.0)