Care2 recently notified its approximately 18 million users of a security breach, and stated that it's resetting all users' passwords.

"In its FAQ, the online community said that it discovered the breach on December 27, but as of December 28, 'We are currently unable to determine the full extent of the security breach,'" reports.

"The site is forcing a password reset and urging members to change their passwords on other sites if they re-use passwords," the article states.

Go to "If it’s Friday, it’s time to reset almost 18 million passwords?" to read the details.

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