Facebook might have another Cambridge Analytica on its hands. In a late Friday news dump, Facebook revealed that today it filed a lawsuit alleging South Korean analytics firm Rankwave abused its developer platform, and has refused to cooperate with a mandatory compliance check regarding how it used Facebook data.

TechCrunch has attained a copy of the lawsuit that alleges that Rankwave misused Facebook data outside of the apps where it was collected, purposefully delayed responding to a cease-and-desist order, claimed it didn’t violate Facebook policy, lied about not using its apps since 2018 when they were accessed in April 2019, and then refused to comply with a mandatory audit of its data practices.

“By filing the lawsuit, we are sending a message to developers that Facebook is serious about enforcing our policies, including requiring developers to cooperate with us during an investigation” Facebook’s director of platform enforcement and litigation Jessica Romero wrote. Facebook tells TechCrunch that “To date Rankwave has not participated in our investigation and we are trying to get more info from them to determine if there was any misuse of Pages data.”

Facebook explains that “Rankwave used the Facebook data associated with Rankwave’s apps to create and sell advertising and marketing analytics and models — which violated Facebook’s policies and terms”  and that it “failed to comply with Facebook’s requests for proof of Rankwave’s compliance with Facebook policies, including an audit.”

More specifically, Facebook cites that its “Platform Policies largely restrict Developers from using Facebook data outside of the environment of the app, for any purpose other than enhancing the app users’ experience on the app.” But Rankwave used Facebook data outside those apps.

Facebook alleges that “Rankwave’s B2B apps were installed and used by businesses to track and analyze activity on their Facebook Pages . . . Rankwave operated a consumer app called the “Rankwave App.” This consumer app was designed to measure the app user’s popularity on Facebook by analyzing the level of interaction that other users had with the app user’s Facebook posts. On its website, Rankwave claimed that this app calculated a user’s ‘Social influence score’ by ‘evaluating your social activities’ and receiving ‘responses from your friends.'”

Facebook is seeking monetary damages plus injunctive relief restraining Rankwave from accessing the Facebook Platform, requiring it to comply with Facebook’s audit, requiring that it delete all Facebook data.

You can learn more about Rankwave’s analytics practices from this 2014 presentation.