March 11 (UPI) -- Facebook has filed a lawsuit against two Ukrainian web operators for collecting private user data and putting advertisements into their news feeds.
The lawsuit, filed in Northern California federal court Friday, accused Gleb Sluchevsky and Andrey Gorbachov of being a part of a long-term hacking scheme in which they enticed users to install malicious browser plugins promising horoscopes or "character and popularity" tests. It infected about 63,000 browsers, the suit said.