Facebook has sued an analytics firm for misusing its data.
Rankwave has been accused of unlawfully using users' information to sell ads.
Facebook says the South Korean firm failed to co-operate with efforts to verify how compliant it's been with the social media network's policies.
They say Rankwave used more than two dozen mobile applications to track comments and likes on Facebook pages.

Witkoff and Kushner to travel to Pakistan for talks, Iran to make 'offer'
Major Russian attack on Ukraine kills seven, wounds dozens
US military says it struck vessel in Eastern Pacific, killing two
Firefighters in Japan struggle to contain Iwate blazes with over 3,000 evacuated
Israel, Lebanon extend ceasefire as Trump seeks 'best deal' with Iran