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.

Trump adds seven countries to full travel ban list
Indian parliament votes to allow private firms in nuclear power sector
Doctors in England start five-day walkout during flu surge
Israeli settler kills 16-year-old Palestinian in West Bank, mayor says
Paris' Louvre reopens partially but staff vote to extend strike
