Facebook is suing a South Korean firm it accuses of unlawfully using data to sell marketing and advertising.
The social network is asking a judge to force Rankwave to allow it to audit the firm’s activities to see if user data was obtained and potentially sold.
A source at Facebook told the BBC it was as yet unable to say how much data or how many users may be affected.
The network said the move would "send a message to developers that Facebook is serious about enforcing our policies".
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