2.33M accounts from Patreon (patreon.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsPayment historiesPhysical addressesPrivate messagesWebsite activity
In October 2015, the crowdfunding site Patreon was hacked and over 16GB of data was released publicly. The dump included almost 14GB of database records with more than 2.3M unique email addresses, millions of personal messages and passwords stored as bcrypt hashes.
Source: Have I Been Pwned (CC BY 4.0)