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The cache may also include 15 million email addresses connected to deleted accounts, according to Leaked Source.
The hacker claiming responsibility, who goes by the handle ROR[RG], posted several spreadsheets detailing the data records of more than 3.5 million users.
The hack also revealed that the company had kept information on 15 million accounts that users had deleted, as well as information on users for assets it no longer owned, such as Penthouse.
By comparison, the Ashley Madison hack that took place in July 2015 revealed 32 million accounts, although that attack was also accompanied by a more aggressive extortion campaign.
On 21 May Channel 4 News revealed that hackers had posted the deeply personal sexual information of around 3.9m users of Adult Friend Finder, which is one of the world’s largest dating websites.
The data gave not only usernames, postal codes and dates of birth, but also an indication of which users were seeking an extra-marital affair.