New York (CNN) Facebook sued a South Korean company on Friday for alleged misuse of Facebook data.

In the lawsuit filed in a California court, Facebook admitted it has not determined what personal user information may have been misused by Rankwave, which offers apps to consumers and businesses.

Facebook alleges Rankwave used Facebook data to "create and sell advertising and marketing analytics and models," against its policies.

The social media company announced it was suing Rankwave Friday evening. Facebook has earned a reputation for releasing news about the potential misuse of its users' data late on Fridays and on the eves of public holidays, after the markets close.

Facebook has allowed third party developers to access Facebook user data, with users' consent, to run features like those that allow users to login to other service with their Facebook credentials, take online quizzes and play games. The Facebook data, including user data, that app developers access is only supposed to be used for functionalities like those, Facebook says.

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