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.

Airbus A320 recall disrupts Asian travel as carriers scramble to patch software
Hong Kong mourns victims of blaze that killed 128 and counting
Hong Kong tower fire toll rises to 128, over 200 remain missing
Ukraine's top peace negotiator quits after raid by anti-graft police
