Reusing four-year-old passwords from MySpace for GitHub? (credit: ABC Photo Archives / Getty Images)

Plaintext passwords, usernames, e-mail addresses, and a wealth of other personal information has been published for more than 2.2 million people who created accounts with ClixSense, a site that claims to pay users for viewing ads and completing online surveys. The people who dumped it say they’re selling data for another 4.4 million accounts.

Troy Hunt, operator of the breach notification service Have I Been Pwned?, said he reviewed the file and concluded it almost certainly contains data taken from ClixSense. Besides unhashed passwords and e-mail addresses, the dump includes users’ dates of birth, sex, first and last names, home addresses, IP addresses, account balances, and payment histories.

A post advertising the leaked data said it was only a sample of personal information taken from a compromised database of more than 6.6 million ClixSense user accounts. The post said that the larger, unpublished data set also includes e-mails and was being sold for an undisclosed price. While the message posted over the weekend to has since been removed, the two sample database files remained active at the time this post was being prepared. The Pastebin post, which was published on Saturday and taken down a day or two later, read in part:

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6.6 million plaintext passwords exposed as site gets hacked to the bone