4.35M accounts from MemeChat (memechat.app) were exposed in this breach. Besides email addresses, it included usernames.
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Email addressesUsernames
In mid-2022, "the ultimate hub of memes" MemeChat suffered a data breach that exposed 7.4M records. Alleged to be due to a misconfigured Elasticsearch instance, the data contained 4.3M unique email addresses alongside usernames.
Source: Have I Been Pwned (CC BY 4.0)